Hi Ruoshi,
I understand that you are able to view the library separately but not in Simulink Block Library.
So I assume that the following command produces desired result:
>> canlib
The above mentioned command when executed in MATLAB opens the CAN Communication Library.
But as your unable to see it in the Simulink Blockset Library, you can try the following steps:
>> restoredefaultpath
>> rehash toolboxcache
These both functions will reset the MATLAB and other toolboxes to default settings.
