diff --git a/adc-da-report/src/main/java/com/adc/da/report/service/impl/IReportServiceImpl.java b/adc-da-report/src/main/java/com/adc/da/report/service/impl/IReportServiceImpl.java
index c51eb97..a0de580 100644
--- a/adc-da-report/src/main/java/com/adc/da/report/service/impl/IReportServiceImpl.java
+++ b/adc-da-report/src/main/java/com/adc/da/report/service/impl/IReportServiceImpl.java
@@ -322,10 +322,6 @@ public class IReportServiceImpl implements IReportService {
                 break;
         }
         FileUtil.deleteFile(path);
-        if (StringUtils.isNotBlank(html)){
-            html = html.replaceAll("<img ", "<img class ='preview-img' ");
-            html = html.replaceAll("img \\{", ".preview-img {");
-        }
         return html;
     }
 }
diff --git a/adc-da-report/src/main/java/com/adc/da/report/util/PdfUtil.java b/adc-da-report/src/main/java/com/adc/da/report/util/PdfUtil.java
index 4d09cf9..93b699a 100644
--- a/adc-da-report/src/main/java/com/adc/da/report/util/PdfUtil.java
+++ b/adc-da-report/src/main/java/com/adc/da/report/util/PdfUtil.java
@@ -86,10 +86,10 @@ public class PdfUtil {
         buffer.append("</head>\r\n");
         buffer.append("<body style=\"background-color:gray;\">\r\n");
         buffer.append("<style>\r\n");
-        buffer.append("img {background-color:#fff; text-align:center; width:100%; max-width:100%;margin-top:6px;}\r\n");
+        buffer.append(".preview-img {background-color:#fff; text-align:center; width:100%; max-width:100%;margin-top:6px;}\r\n");
         buffer.append("</style>\r\n");
         for(int i=0;i<baseList.size();i++){
-            buffer.append("<img src="+baseList.get(i)+" />");
+            buffer.append("<img class ='preview-img' src="+baseList.get(i)+" />");
         }
 
         buffer.append("</body></html>");
diff --git a/adc-da-report/src/main/java/com/adc/da/report/util/PptUtil.java b/adc-da-report/src/main/java/com/adc/da/report/util/PptUtil.java
index aab61d8..8764ba0 100644
--- a/adc-da-report/src/main/java/com/adc/da/report/util/PptUtil.java
+++ b/adc-da-report/src/main/java/com/adc/da/report/util/PptUtil.java
@@ -240,10 +240,10 @@ public class PptUtil {
         buffer.append("</head>\r\n");
         buffer.append("<body style=\"background-color:gray;\">\r\n");
         buffer.append("<style>\r\n");
-        buffer.append("img {background-color:#fff; text-align:center; width:100%; max-width:100%;margin-top:6px;}\r\n");
+        buffer.append(".preview-img {background-color:#fff; text-align:center; width:100%; max-width:100%;margin-top:6px;}\r\n");
         buffer.append("</style>\r\n");
         for(int i=0;i<baseList.size();i++){
-            buffer.append("<img src="+baseList.get(i)+" />");
+            buffer.append("<img class ='preview-img' src="+baseList.get(i)+" />");
         }
 
         buffer.append("</body></html>");
