This invention provides one method for frequency plan by use of assistant base station by TDD type, which comprises the following steps: a, assistant base station receives control bench order; b, assistant base station sends TDD and opens receiver; c, if whole system frequency section has non-scanned points setting the frequency as one non scanned one and receiving other station signals; d, computing assistant station signals and other station signal co relationship, other station emission power and signal to noise ratio and distance and direction; e, judging whether the frequency point is matched; f, judging whether there is interference and its direction by assistant station. |