In order to realize one- point to multi- point simultaneous space laser communication technology, the optical principle and APT (acquisition point and track) technology are studied. The overall scheme is introduced, and then the working process of APT system and relationship between miss distances and mirror rotation angle in the acquisition and coarse tracking process are analyzed. Then, the key technologies such as multi- actuator linkage control, image processing recognition and location, low error control when two mirror handover is in acquisition and coarse tracking process are analyzed. Finally, the prototype and experiment of one- point to multi- point simultaneous laser communication are introduced. Experimental results show that three terminals can communicate simultaneous, and the communication angle is 360° in azimuth and ± 19° in pitch. This indicates that the optical principle and APT technology can meet the requirements of one- point to multi-point space simultaneous laser communication.