diff --git a/README.md b/README.md
index 5e0a801..8906c55 100644
--- a/README.md
+++ b/README.md
@@ -299,10 +299,9 @@ a: No such file or directory
 数据处理模块包括读取数据（read_data）、保存数据（save_data）、打印数据（print_data）、查询数据（query_data）、添加数据（add_data）、更新数据（update_data）、删除数据（delete_data）、数据排序（sort_data）和生成图表（make_chart）等子模块。其中查询、添加、更新和删除数据还会用到根据编号查询数据的方法（find）。
 
 上述各模块通过主程序（main）进行调用，系统模块图如下。
-![](pictures/xitongmoban.drawio.svg)
 
+![](pictures/xitongmoban.drawio.svg)
 
-## 详细设计
 
 
 各模块的主要功能如下：
@@ -343,6 +342,18 @@ Step 2.12: if c == CMD_QUIT then 退出
 
 ![](pictures/main_chart.drawio.svg)
 
+
+#### read_data
+
+Step 1: 输入文件名
+Step 2: 打开文件
+Step 3: if 文件为空 then 结束
+Step 4: else 读取文件
+Step 5: 提示读取并记录
+
+![](pictures/read.drawio.svg)
+
+
 #### save_data
 
 Step 1: 输入文件名
@@ -369,14 +380,13 @@ Step 1: 输出学号、姓名、成绩
 ![](pictures/print.drawio.svg)
 
 #### read_data
+#### delete_data
 
-Step 1: 输入文件名
-Step 2: 打开文件
-Step 3: if 文件为空 then 结束
-Step 4: else 读取文件
-Step 5: 提示读取并记录
-
-![](pictures/read.drawio.svg)
+Step 1: 输入学号
+Step 2: if 不存在 then 提示学生不存在并结束
+Step 3: else 删除学生信息
+Step 4: 提示删除成功
+![](pictures/delete.drawio.svg)
 
 #### make_chart
 
diff --git a/pictures/delete.drawio.svg b/pictures/delete.drawio.svg
new file mode 100644
index 0000000..dc8fc3d
--- /dev/null
+++ b/pictures/delete.drawio.svg
@@ -0,0 +1,129 @@
+<svg host="65bd71144e" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="621px" height="841px" viewBox="-0.5 -0.5 621 841" content="&lt;mxfile&gt;&lt;diagram id=&quot;qF64KuNW_ocn6PQy4_HQ&quot; name=&quot;第 1 页&quot;&gt;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&lt;/diagram&gt;&lt;/mxfile&gt;">
+    <defs/>
+    <g>
+        <ellipse cx="70" cy="40" rx="60" ry="40" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 40px; margin-left: 11px;">
+                        <div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
+                                delete_data
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="70" y="44" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    delete_data
+                </text>
+            </switch>
+        </g>
+        <path d="M 10 210 L 30 150 L 130 150 L 110 210 Z" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 180px; margin-left: 11px;">
+                        <div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
+                                输入学号
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="70" y="184" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    输入学号
+                </text>
+            </switch>
+        </g>
+        <path d="M 65 360 L 65 503.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 65 508.88 L 61.5 501.88 L 65 503.63 L 68.5 501.88 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <path d="M 130 320 L 569 320 Q 579 320 578.96 330 L 578.86 354.65" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 578.84 359.9 L 575.37 352.89 L 578.86 354.65 L 582.37 352.92 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <path d="M 65 280 L 130 320 L 65 360 L 0 320 Z" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 128px; height: 1px; padding-top: 320px; margin-left: 1px;">
+                        <div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
+                                学号存在？
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="65" y="324" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    学号存在？
+                </text>
+            </switch>
+        </g>
+        <path d="M 65 570 L 65 753.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 65 758.88 L 61.5 751.88 L 65 753.63 L 68.5 751.88 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <path d="M 5 570 L 25 510 L 125 510 L 105 570 Z" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 540px; margin-left: 6px;">
+                        <div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
+                                学号不存在
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="65" y="544" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    学号不存在
+                </text>
+            </switch>
+        </g>
+        <path d="M 500 420 L 520 360 L 620 360 L 600 420 Z" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 390px; margin-left: 501px;">
+                        <div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
+                                删除学生信息
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="560" y="394" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    删除学生信息
+                </text>
+            </switch>
+        </g>
+        <path d="M 560 520 L 560 710 Q 560 720 550 720 L 76.37 720" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 71.12 720 L 78.12 716.5 L 76.37 720 L 78.12 723.5 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <path d="M 500 520 L 520 460 L 620 460 L 600 520 Z" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <g transform="translate(-0.5 -0.5)">
+            <switch>
+                <foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 490px; margin-left: 501px;">
+                        <div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
+                            <div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
+                                已更新
+                            </div>
+                        </div>
+                    </div>
+                </foreignObject>
+                <text x="560" y="494" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                    已更新
+                </text>
+            </switch>
+        </g>
+        <ellipse cx="65" cy="800" rx="60" ry="40" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/>
+        <path d="M 70 80 L 70 143.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 70 148.88 L 66.5 141.88 L 70 143.63 L 73.5 141.88 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <path d="M 70 210 L 70 283.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
+        <path d="M 70 288.88 L 66.5 281.88 L 70 283.63 L 73.5 281.88 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
+        <path d="M 590 460 L 590 420" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
+    </g>
+    <switch>
+        <g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/>
+        <a transform="translate(0,-5)" xlink:href="https://www.diagrams.net/doc/faq/svg-export-text-problems" target="_blank">
+            <text text-anchor="middle" font-size="10px" x="50%" y="100%">
+                Text is not SVG - cannot display
+            </text>
+        </a>
+    </switch>
+</svg>
\ No newline at end of file
diff --git a/pictures/save_data.drawio.svg b/pictures/save_data.drawio.svg
index 47de788..9028fcf 100644
--- a/pictures/save_data.drawio.svg
+++ b/pictures/save_data.drawio.svg
@@ -1,4 +1,4 @@
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+<svg host="65bd71144e" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="341px" height="751px" viewBox="-0.5 -0.5 341 751" content="&lt;mxfile&gt;&lt;diagram id=&quot;upyrMhvOQVLzjFjaz9En&quot; name=&quot;Page-1&quot;&gt;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&lt;/diagram&gt;&lt;/mxfile&gt;">
     <defs/>
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@@ -43,17 +43,13 @@
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             </switch>
         </g>
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+        <rect x="0" y="540" width="150" height="70" rx="10.5" ry="10.5" fill="#ffffff" stroke="#000000" pointer-events="all"/>
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+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 148px; height: 1px; padding-top: 575px; margin-left: 1px;">
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@@ -63,20 +59,16 @@
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+                <text x="75" y="579" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
                     关闭文件
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+                    <div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 138px; height: 1px; padding-top: 555px; margin-left: 201px;">
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@@ -86,12 +78,12 @@
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+                <text x="270" y="559" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
                     提示打开文件失败
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+        <ellipse cx="75" cy="715" rx="75" ry="35" fill="#ffffff" stroke="#000000" pointer-events="all"/>
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@@ -113,8 +105,6 @@
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             </switch>
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         <g transform="translate(-0.5 -0.5)">
             <switch>
@@ -151,6 +141,16 @@
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             </switch>
         </g>
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+        <path d="M 75 610 L 75 673.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
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