diff --git a/README.md b/README.md
index 3e0b5df..b278375 100644
--- a/README.md
+++ b/README.md
@@ -343,6 +343,18 @@ 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
@@ -361,15 +373,6 @@ Step 3: else 学号存在 then 输出学号、姓名、成绩
 
 ![](pictures/query_data.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)
 
 #### make_chart
 
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/>
     <g>
         <path d="M 80 70 L 80 103.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
@@ -43,17 +43,13 @@
                 </text>
             </switch>
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         <path d="M 141.82 466.37 L 141.82 458.54 L 144.16 461.67 L 148.08 461.67 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
-        <path d="M 75 600 L 75 623.63" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/>
-        <path d="M 75 628.88 L 71.5 621.88 L 75 623.63 L 78.5 621.88 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
-        <rect x="0" y="530" width="150" height="70" rx="10.5" ry="10.5" fill="#ffffff" stroke="#000000" pointer-events="all"/>
+        <rect x="0" y="540" width="150" height="70" rx="10.5" ry="10.5" fill="#ffffff" stroke="#000000" 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: 148px; height: 1px; padding-top: 565px; margin-left: 1px;">
+                    <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;">
                         <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;">
                                 <font color="#000000" style="font-size: 12px;">
@@ -63,20 +59,16 @@
                         </div>
                     </div>
                 </foreignObject>
-                <text x="75" y="569" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                <text x="75" y="579" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
                     关闭文件
                 </text>
             </switch>
         </g>
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-        <path d="M 260 490 L 210 490 Q 200 490 202.75 480.38 L 217.25 429.62 Q 220 420 230 420 L 330 420 Q 340 420 337.25 429.62 L 322.75 480.38 Q 320 490 310 490 Z" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
+        <path d="M 260 590 L 210 590 Q 200 590 202.75 580.38 L 217.25 529.62 Q 220 520 230 520 L 330 520 Q 340 520 337.25 529.62 L 322.75 580.38 Q 320 590 310 590 Z" fill="#ffffff" stroke="#000000" 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: 138px; height: 1px; padding-top: 455px; margin-left: 201px;">
+                    <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;">
                         <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;">
                                 <font color="#000000">
@@ -86,12 +78,12 @@
                         </div>
                     </div>
                 </foreignObject>
-                <text x="270" y="459" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
+                <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
                 </text>
             </switch>
         </g>
-        <ellipse cx="75" cy="665" rx="75" ry="35" fill="#ffffff" stroke="#000000" pointer-events="all"/>
+        <ellipse cx="75" cy="715" rx="75" ry="35" fill="#ffffff" stroke="#000000" pointer-events="all"/>
         <path d="M 80 170 L 80 203.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
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         <path d="M 10 170 L 30 110 L 150 110 L 130 170 Z" fill="#ffffff" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/>
@@ -113,8 +105,6 @@
                 </text>
             </switch>
         </g>
-        <path d="M 80 270 L 80 303.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
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         <g transform="translate(-0.5 -0.5)">
             <switch>
@@ -151,6 +141,16 @@
                 </text>
             </switch>
         </g>
+        <path d="M 75.24 491.36 L 75.03 533.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
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+        <path d="M 80 270 L 80 303.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
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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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