This article introduces a SDMA technology of control channel

to resolve the limit of the control channel code for HSPA application.The primary theory of the technology is SDMA（Spatial Division Mutiple Access）.By the technology

the limit of the control channel code can be resolved

then the limit of HSPA user number can be resolved corresponding

the two limits are the important problem at the time of applying the HSPA SDMA technoloy of data channel.