diff --git a/NEWS.md b/NEWS.md
index 422bae9c..847c99f5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -2,6 +2,7 @@ Red Panda C++ Version 1.1.0
   - enhancement: when ctrl+mouse cursor hovered an identifier or header name, use underline to highlight it
   - enhancement: mark editor as modified, if the editing file is changed by other applications.
   - enhancement: When the editing files is changed by other applications, only show one notification dialog for each file.
+  - fix: c files added to a project will be compiled as c++ file.
 
 Red Panda C++ Version 1.0.10
   - fix: modify watch doesn't work
diff --git a/RedPandaIDE/compiler/compiler.cpp b/RedPandaIDE/compiler/compiler.cpp
index 4bf3dec5..70054c89 100644
--- a/RedPandaIDE/compiler/compiler.cpp
+++ b/RedPandaIDE/compiler/compiler.cpp
@@ -466,7 +466,7 @@ QString Compiler::getLibraryArguments(FileType fileType)
                 int waitCount = 0;
                 //wait parsing ends, at most 1 second
                 while(parser->parsing()) {
-                    if (waitCount>0)
+                    if (waitCount>10)
                         break;
                     waitCount++;
                     QThread::msleep(100);
diff --git a/RedPandaIDE/project.cpp b/RedPandaIDE/project.cpp
index 5bf1db73..33f7cf37 100644
--- a/RedPandaIDE/project.cpp
+++ b/RedPandaIDE/project.cpp
@@ -278,13 +278,27 @@ PProjectUnit Project::newUnit(PProjectModelNode parentNode, const QString& custo
                                      false, parentNode));
     newUnit->node()->unitIndex = count;
     //parentNode.Expand(True);
-    newUnit->setCompile(true);
-    if (getFileType(customFileName) == FileType::CSource) {
+    switch(getFileType(customFileName)) {
+    case FileType::CSource:
+        newUnit->setCompile(true);
         newUnit->setCompileCpp(false);
-    } else {
+        newUnit->setLink(true);
+        break;
+    case FileType::CppSource:
+        newUnit->setCompile(true);
+        newUnit->setCompileCpp(true);
+        newUnit->setLink(true);
+        break;
+    case FileType::WindowsResourceSource:
+        newUnit->setCompile(true);
         newUnit->setCompileCpp(mOptions.isCpp);
+        newUnit->setLink(false);
+        break;
+    default:
+        newUnit->setCompile(false);
+        newUnit->setCompileCpp(false);
+        newUnit->setLink(false);
     }
-    newUnit->setLink(true);
     newUnit->setPriority(1000);
     newUnit->setOverrideBuildCmd(false);
     newUnit->setBuildCmd("");
@@ -976,7 +990,7 @@ PProjectUnit Project::addUnit(const QString &inFileName, PProjectModelNode paren
     switch(getFileType(inFileName)) {
     case FileType::CSource:
         newUnit->setCompile(true);
-        newUnit->setCompileCpp(mOptions.isCpp);
+        newUnit->setCompileCpp(false);
         newUnit->setLink(true);
         break;
     case FileType::CppSource: