diff --git a/data/ch_wireshark/sec_arp.tex b/data/ch_wireshark/sec_arp.tex
index fafc29e..1d43652 100644
--- a/data/ch_wireshark/sec_arp.tex
+++ b/data/ch_wireshark/sec_arp.tex
@@ -220,7 +220,7 @@ IP地址长度为4字节。每个字段的含义如下：
 
   \begin{figure}[!ht]
     \centering
-    \includegraphics[width=16cm]{wireshark-statistic}
+    \includegraphics[width=12cm]{wireshark-statistic}
     \caption{统计功能}
     \label{fig:c:wireshark_wireshark-statistic}
   \end{figure}