解決方法：
1〉從Windows的Start Menu開始，Xilinx ISE Design Suite 13.4 —〉EDK —〉Tools —〉Compile Simulation Libraries
2〉從Process菜單，選擇Process Properties...，設置Compiled Libraey Directory

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3〉set the Enviroment variables（） :
- MODELSIM environment variable to point to the modelsim.ini file
- WD_MGC environment variable to point to the directory containing the modelsim.ini file

4〉復制Xilinx\13.4\ISE_DS\EDK\modelsim.ini里的[Library]節中的下列行到到modeltech_10.1b\modelsim.ini里的[Library]節下
secureip = D:\Xilinx\13.4\ISE_DS\EDK/secureip
unisim = D:\Xilinx\13.4\ISE_DS\EDK/unisim
unimacro = D:\Xilinx\13.4\ISE_DS\EDK/unimacro
unisims_ver = D:\Xilinx\13.4\ISE_DS\EDK/unisims_ver
unimacro_ver = D:\Xilinx\13.4\ISE_DS\EDK/unimacro_ver
simprim = D:\Xilinx\13.4\ISE_DS\EDK/simprim
simprims_ver = D:\Xilinx\13.4\ISE_DS\EDK/simprims_ver
xilinxcorelib = D:\Xilinx\13.4\ISE_DS\EDK/xilinxcorelib
xilinxcorelib_ver = D:\Xilinx\13.4\ISE_DS\EDK/xilinxcorelib_ver
uni9000_ver = D:\Xilinx\13.4\ISE_DS\EDK/uni9000_ver
cpld = D:\Xilinx\13.4\ISE_DS\EDK/cpld
cpld_ver = D:\Xilinx\13.4\ISE_DS\EDK/cpld_ver
edk = D:\Xilinx\13.4\ISE_DS\EDK/edk