解决方法：
1〉从Windows的Start Menu开始，Xilinx ISE Design Suite 13.4 —〉EDK —〉Tools —〉Compile Simulation Libraries
2〉从Process菜单，选择Process Properties...，设置Compiled Libraey Directory
3〉set the Enviroment variables（http://forums.xilinx.com/t5/Installation-and-Licensing/solved-Failed-to-get-the-pre-compiled-simulation-library/td-p/72635） :

- 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〉复制Xilinx\13.4\ISE_DS\EDK\modelsim.ini里的[Library]节中的下列行到到modeltech_10.1b\modelsim.ini里的[Library]节下
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