In recent years, space debris is increasing with the development of space technology, and has a serious effect on the safety operation of on-orbit spacecraft. Therefore, it is urgent to detect and remove the space debris. With the increasing demand for space debris detection, the space debris detection system gradually develops to a integrated and multifunctional system. An integrated optical system of ranging, imaging and communication is proposed. The maximum detection range of imaging tracking and the received power of ranging communication are analyzed, and the optimum parameters of the integrated optical system are chosen. The results show that the best obscure ratio is in the range of 0.144-0.172, the transmittivity of secondary mirror film is in the range of 0.3-0.6, and the optimal transmittivity is 0.462. This study provides a reference for the study on the integrated system used for space debris detection.