A pilot frequency applied to MIMO system and supporting various functions is described. The pilot frequency of various types comprises a beaconing pilot frequency, an MIMO pilot frequency, a manipulating benchmark or a manipulating pilot frequency and a carrier pilot frequency. The beaconing pilot frequency is sent from all transmitting antennas and used for timing and obtaining the frequency. The MIMO pilot frequency is sent from all transmitting antennas and covered by different orthogonal codes distributed to the transmitting antennas. The MIMO pilot frequency is to estimate the channel. The manipulating pilot frequency is sent a special intrinsic mode of the MIMO channel and user terminal special. The manipulating benchmark is to estimate the channel. The carrier pilot frequency is sent on an appointed sub-band/antenna and to track the phase of the carrier signal. Various pilot frequency transmission plans are designed based on these pilot frequency types.