Aiming at the TD-SCDMA system and associating with its key technologies, resources, services and interferences, the optimum dynamic channel allocation (DCA) strategy about the frequency, the time slot, the code and the position beam is searched. For comparing the performance of different DCA arithmetic, four DCA arithmetics are proposed~ moreover, the practical simulative models are built and the practical simulative parameters are set. Through the simulation, some conclusions about the different DCA arithmetic and simulative parameters to th...