For the development and application of detecting laser phased array radar based on technology of microwave phased array radar, the basic knowledge of microwave phased array radar antenna was simulated and learned at first. And partial content, which can be compared between microwave phased array radar antenna and optical fiber laser phased array radar, was compacted. Then, technical essential and potential ability of optical fiber laser phased array antenna was analyzed, its system function and scale were calculated based on the existing research and development level. Finally, the technical features and main questions of optical fiber laser phased array and microwave phased array antenna were tried to discuss. The system configuration of each other was put forward, which not only helped to improve the microwave phased array radar in complex electromagnetic environment of high-speed, short-range stealth and multi target detection, recognition and localization ability, but also may be appropriate to reduce the pressure on paint with the laser phased array searching a wide range regional target.