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右鍵一個Project，可以發現有兩個地方設置Include的相關目錄：

1. VC++ Directories -> Include Directories
2. C/C++ -> General -> Additional Include Directories

不知道具體有什么區別，后在MSDN上得到答案：

“VC++ Directories -> Include Directories” : Directory settings displayed in the window are the directories that Visual Studio will search for include files referred to in your source code files. Corresponds to environment variable INCLUDE. More information : http://msdn.microsoft.com/en-us/library/t9az1d21(v=vs.80).aspx

“C/C++ -> General -> Additional Include Directories”: The directory to be added to the list of directories searched for include files. More information : http://msdn.microsoft.com/en-us/library/73f9s62w(v=vs.80).aspx

下面那個鏈接講的比較清楚了：

The compiler searches for directories in the following order:

1.Directories containing the source file.

2.Directories specified with the /I option, in the order that CL encounters them.

3.Directories specified in the INCLUDE environment variable.

order2中的/I是由C/C++ -> General -> Additional Include Directories設置的。

order3中的INCLUDE是由VC++ Directories -> Include Directories設置的。