diff --git a/data/ch_wireshark/sec_ip.tex b/data/ch_wireshark/sec_ip.tex
index 026d906..7fff86c 100644
--- a/data/ch_wireshark/sec_ip.tex
+++ b/data/ch_wireshark/sec_ip.tex
@@ -248,7 +248,7 @@ tracert命令（Linux）格式和常用参数如图\ref{fig:tracert-cmd}所示
 
   \begin{figure}[!ht]
     \centering
-    \includegraphics[width=16cm]{wireshark-monitor}
+    \includegraphics[width=12cm]{wireshark-monitor}
     \caption{Wireshark监视器界面}
     \label{fig:c:wireshark_wireshark-monitor}
   \end{figure}
@@ -258,7 +258,7 @@ tracert命令（Linux）格式和常用参数如图\ref{fig:tracert-cmd}所示
 
   \begin{figure}[!ht]
     \centering
-    \includegraphics[width=16cm]{ip-view}
+    \includegraphics[width=12cm]{ip-view}
     \caption{查看IP数据报}
     \label{fig:c:wireshark_ip-view}
   \end{figure}
@@ -268,7 +268,7 @@ tracert命令（Linux）格式和常用参数如图\ref{fig:tracert-cmd}所示
 
   \begin{figure}[!ht]
     \centering
-    \includegraphics[width=16cm]{echo-request}
+    \includegraphics[width=12cm]{echo-request}
     \caption{Echo request示例}
     \label{fig:c:wireshark_echo-request}
   \end{figure}
@@ -302,7 +302,7 @@ tracert命令（Linux）格式和常用参数如图\ref{fig:tracert-cmd}所示
 
   \begin{figure}[!ht]
     \centering
-    \includegraphics[width=16cm]{wireshark-filter-setup}
+    \includegraphics[width=12cm]{wireshark-filter-setup}
     \caption{在Wireshark中设置过滤条件}
     \label{fig:c:wireshark_wireshark-filter-setup}
   \end{figure}