A novel opto electric phase discrimination system based on CCD presented in this paper.As it works,a CCD receiver collects the sinusoidal modulated light signal.Its exposure time is controlled by a square wave voltage signal with the same frequency as the input light signal.So the correlative operations process in the CCD automatically.Its output signal contains both the phase and intensity information of the input light.In order to figure out the unique phase delay between the input light and the local signal,triple measurements methodology is adopted.In our experiment,the relative error of singla pixel measurement is about 0.2 % and the relative error of whole line measurement is less than 1.0 %.