Abstract: Utilizing the intermittently working character of pulse modulation radar signal, different wavelength laser light is time division modulated with the radar signal. Chirped Fiber Grating reflects and delays an optical pulse train of modulated RF signal, in which different wavelength laser light reflect at different reflector positions. An experiment is made on the pulse radar signal which carrier frequency is 4 GHz. The results indicate that the delay of the 4 array is identical with delay the antenna beam points in theory. It satisfies the request of the system design.