A method for using smart antenna in a frequency division duplex wireless communication system, comprising: using independent smart antenna array, feeder cables, radio frequency transmitters/radio frequency receivers, but a common baseband signal processor in downlink radio frequency transmitting and uplink radio frequency receiving, respectively; getting estimate values of signal direction-of-arrival, hereinafter referred to as DOA, from an uplink receiving signal, and determining direction of the main path of the uplink receiving signal; getting an expected downlink transmitting beam form according to the main path direction; CHARACTERISED IN THAT: getting estimate values of signal DOA from an uplink receiving signal and determining direction of the main path of the uplink receiving signal further comprise the steps of: demodulating and de-spreading N digital signals of an uplink receiving signal, coming from the receiving smart antenna array and the radio frequency receivers (41, 42,..., 4N) by N receiving signal preprocessors; making DOA estimate for each de-spread digital signal by a receiving beam former, respectively; combining every de-spread digital signal to perform receiving beam forming, and getting direction of the main path of the uplink receiving signal. using independent smart antenna array, feeder cables, radio frequency transmitters/radio frequency receivers, but a common baseband signal processor in downlink radio frequency transmitting and uplink radio frequency receiving, respectively; getting estimate values of signal direction-of-arrival, hereinafter referred to as DOA, from an uplink receiving signal, and determining direction of the main path of the uplink receiving signal; getting an expected downlink transmitting beam form according to the main path direction; CHARACTERISED IN THAT: getting estimate values of signal DOA from an uplink receiving signal and determining direction of the main path of the uplink receiving signal further comprise the steps of: demodulating and de-spreading N digital signals of an uplink receiving signal, coming from the receiving smart antenna array and the radio frequency receivers (41, 42,..., 4N) by N receiving signal preprocessors; making DOA estimate for each de-spread digital signal by a receiving beam former, respectively; combining every de-spread digital signal to perform receiving beam forming, and getting direction of the main path of the uplink receiving signal. getting estimate values of signal DOA from an uplink receiving signal and determining direction of the main path of the uplink receiving signal further comprise the steps of: demodulating and de-spreading N digital signals of an uplink receiving signal, coming from the receiving smart antenna array and the radio frequency receivers (41, 42,..., 4N) by N receiving signal preprocessors; making DOA estimate for each de-spread digital signal by a receiving beam former, respectively; combining every de-spread digital signal to perform receiving beam forming, and getting direction of the main path of the uplink receiving signal. demodulating and de-spreading N digital signals of an uplink receiving signal, coming from the receiving smart antenna array and the radio frequency receivers (41, 42,..., 4N) by N receiving signal preprocessors; making DOA estimate for each de-spread digital signal by a receiving beam former, respectively; combining every de-spread digital signal to perform receiving beam forming, and getting direction of the main path of the uplink receiving signal.