A multiple antenna mode control method based on Access Point, applicable to communication systems containing an Access Point and a Station, comprises the following steps: Step 1, the Access Point periodically sends out (101; 210) a multiple antenna mode set or subset supported by the Access Point; Step 2, the Station reports a multiple antenna mode set or subset supported by the Station, or reports a multiple antenna mode set or subset supported by both the Station and the Access Point, to the Access Point; Step 3, a multiple antenna mode is chosen from a multiple antenna mode set or subset supported by both the Station and the Access Point for communicating; wherein each of the multiple antenna mode set or subset supported by the Access Point, the multiple antenna mode set or subset supported by the Station and the multiple antenna mode set or subset supported by both the Station and the Access Point comprises a plurality of multiple antenna modes selected from the group consisting of spatial multiplexing, spatial diversity and beam forming, and wherein the Step 1 further comprises: the Access point periodically sends a specific broadcast frame with information of the multiple antenna mode set or subset supported by the Access Point by broadcasting in a manner that the Station can analyze; and wherein the multiple antenna mode set refers to all transmitting antenna modes and receiving antenna modes likely to be supported by the Station and the Access Point, the multiple antenna mode set supported by the Access Point refers to all transmitting antenna modes and receiving antenna modes supported by the Access Point, the multiple antenna mode subset supported by the Access Point refers to part of the transmitting antenna modes and receiving antenna modes supported by the Access Point, wherein each multiple antenna mode is determined (105, 295) according to the antenna numbers of both sending and receiving sides as well as a corresponding algorithm. Step 1, the Access Point periodically sends out (101; 210) a multiple antenna mode set or subset supported by the Access Point; Step 2, the Station reports a multiple antenna mode set or subset supported by the Station, or reports a multiple antenna mode set or subset supported by both the Station and the Access Point, to the Access Point; Step 3, a multiple antenna mode is chosen from a multiple antenna mode set or subset supported by both the Station and the Access Point for communicating; wherein each of the multiple antenna mode set or subset supported by the Access Point, the multiple antenna mode set or subset supported by the Station and the multiple antenna mode set or subset supported by both the Station and the Access Point comprises a plurality of multiple antenna modes selected from the group consisting of spatial multiplexing, spatial diversity and beam forming, and wherein the Step 1 further comprises: the Access point periodically sends a specific broadcast frame with information of the multiple antenna mode set or subset supported by the Access Point by broadcasting in a manner that the Station can analyze; and wherein the multiple antenna mode set refers to all transmitting antenna modes and receiving antenna modes likely to be supported by the Station and the Access Point, and wherein the multiple antenna mode set refers to all transmitting antenna modes and receiving antenna modes likely to be supported by the Station and the Access Point, the multiple antenna mode set supported by the Access Point refers to all transmitting antenna modes and receiving antenna modes supported by the Access Point, the multiple antenna mode subset supported by the Access Point refers to part of the transmitting antenna modes and receiving antenna modes supported by the Access Point, wherein each multiple antenna mode is determined (105, 295) according to the antenna numbers of both sending and receiving sides as well as a corresponding algorithm.