diff --git a/main.tex b/main.tex
index a63f892..ec1ed45 100644
--- a/main.tex
+++ b/main.tex
@@ -12,24 +12,19 @@
 
 
 \begin{plantuml}[width=0.4\textwidth]
-@startuml
-skinparam dpi 300
 class 构件
 构件 "1" --> "1..N" 服务
 构件 "1" --> "1..N" 接口
 接口 "1" -> "1" 服务 : ?
-@enduml
 \end{plantuml}
 
 \lipsum[2]
 
 \begin{plantuml}
-@startuml
 class 构件
 构件 "1" --> "1..N" 服务X
 构件 "1" --> "1..N" 接口
 接口 "1" -> "1" 服务 : ?
-@enduml
 \end{plantuml}
 
 \lipsum[3]
diff --git a/plantuml.sty b/plantuml.sty
index 116a2a1..6b2bf69 100644
--- a/plantuml.sty
+++ b/plantuml.sty
@@ -49,13 +49,15 @@
 
 \newif\ifplantuml@center
 \plantuml@centertrue
-\newcommand{\plantumlwidth}{\linewidth}  % only fractions of \linewidth
+\newcommand{\plantumlwidth}{0.4\linewidth}  % only fractions of \linewidth
 
 %%% 主要是定义plantumlipnut输入
 \newwrite\plantuml@out
 \def\plantuml@startgen{%
     \@bsphack
   \immediate\openout\plantuml@out\plantuml@tempfile\plantuml@ext
+  \immediate\write\plantuml@out{@startuml}
+  \immediate\write\plantuml@out{skinparam dpi 300}
   \let\do\@makeother\dospecials
   \catcode`\^^M\active \catcode`\^^I=12
   \def\verbatim@processline{%
@@ -63,6 +65,7 @@
     {\the\verbatim@line}}%
   \verbatim@start}
 \def\plantuml@finishgen{%
+    \immediate\write\plantuml@out{@enduml}
     \immediate\closeout\plantuml@out
   \@esphack
   \plantuml@process