Abstract: This article enumerated the optoelectronic technology to apply in the Modem Radar several aspects, and the key introduction optical fiber technology in the phased-array radar application, had pointed out the design optical fiber transmission system key was the design appropriate fiber optic transmission adapter and enable various ways number also to arrive according to what is believed. In the article in view of the phased-array radar, after introduced the submatrix adapter and the processor adapter as well as the multi-channel signal different way transmission time delay design specifically. This system uses modular adaptive the fiber optic transmission , May realize the data real-time transmission and the control, and has the extendibility,Simultaneously in the article also introduced one kind more practical and simple method, solves the fiber optic transmission phased-array radar system synchronized signal problem. This system works good in the experimental process, has the very big project significance in the phased-army radar system.