diff --git a/README.md b/README.md
index ebd2c50..b845ebf 100644
--- a/README.md
+++ b/README.md
@@ -416,7 +416,7 @@ C8:void foundReaderInfo(Reader* reader);\\查询读者信息
 C9:Reader* LendBook(Reader* reader, Book* book);\\读者借书
 ![C9](images/LendBook.svg)
 C10:void returnBook(Reader* reader, Book* book);\\读者还书
-![C10](images/returnBook-开始.svg)
+![C10](images/returnBook.svg)
 C11:void save(Book* book);\\文件保存
 
 C12:Book* read1();\\从文件读取
diff --git a/images/returnBook.svg b/images/returnBook.svg
new file mode 100644
index 0000000..6256212
--- /dev/null
+++ b/images/returnBook.svg
@@ -0,0 +1,296 @@
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+					<tspan x="648" dy="72" unicode-bidi="embed">book1 = Book* book</tspan>
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+								<tspan x="1908" dy="72" unicode-bidi="embed">reader-&gt;iNum == id</tspan>
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+								<text x="2448" y="2613" fill="#000000" font-family="Arial" font-size="32pt" text-anchor="middle" direction="ltr">
+									<tspan x="2448" dy="72" unicode-bidi="embed">&#36755;&#20837; idbook</tspan>
+								</text>
+							</g>
+							<g>
+								<path fill="#F0E0FF" stroke="#9070A0" stroke-width="5" stroke-dasharray="none" d="M 2232,2844 L 2232,2988 L 2664,2988 L 2664,2844 Z"/>
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+								<text x="2448" y="2865" fill="#000000" font-family="Arial" font-size="32pt" text-anchor="middle" direction="ltr">
+									<tspan x="2448" dy="72" unicode-bidi="embed">getchar()</tspan>
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+											<tspan x="3348" dy="72" unicode-bidi="embed">reader*aiBookId[i]==idbook</tspan>
+										</text>
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+												<tspan x="3996" dy="72" unicode-bidi="embed">reader-&gt;aiBookId[i] = 0</tspan>
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+														<tspan x="4860" dy="72" unicode-bidi="embed">id_book==book-&gt;iNum</tspan>
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+														<tspan x="5472" dy="72" unicode-bidi="embed">getchar()</tspan>
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+													<tspan x="5400" dy="72" unicode-bidi="embed">&#30495;</tspan>
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+													<tspan x="4320" dy="72" unicode-bidi="embed">&#20551;</tspan>
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+													<tspan x="3996" dy="72" unicode-bidi="embed">While&#24490;&#29615;</tspan>
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+												<tspan x="3924" dy="72" unicode-bidi="embed">&#20551;</tspan>
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+												<tspan x="3996" dy="72" unicode-bidi="embed">book = book-&gt;next</tspan>
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+										<tspan x="3924" dy="72" unicode-bidi="embed">&#30495;</tspan>
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+										<tspan x="2772" dy="72" unicode-bidi="embed">&#20551;</tspan>
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+										<tspan x="2448" dy="72" unicode-bidi="embed">i = 0 &#21040; reader*iMax</tspan>
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+									<tspan x="2988" dy="72" unicode-bidi="embed">&#19979;&#19968;&#20010;</tspan>
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+									<tspan x="2340" dy="72" unicode-bidi="embed">&#23436;&#25104;</tspan>
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+									<tspan x="2448" dy="72" unicode-bidi="embed">getchar()</tspan>
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