A kind of orbit determination technology is mainly researched for space target based on method of tracking with double satellites and double cameras in space- based surveillance. The physical idea is that the absolute motion information of space target in earth coordinate system can be computed completely through a series of coordinate transformations and data process. The data are from relative azimuth point information of target in satellite that are measured with optical measurement devices and information of satellite attitude angles and rotation angles of opto- electrical tracking frame that are sensed by corresponding angle sensors. Measurement equation of target in earth coordinate system is gained after describing physical model, coordinate systems and deriving principle of orbit determination in turn. Furthermore, mathematic simulation is researched after analyzing many models including space- based surveillance satellite orbit, opto- electronic tracking and optical imaging. The computation results show the feasibility of this method.