In order to achieve the detection of amplitude and phase of the optical signal at the same time，a new homodyne coherent detection system was designed，including the scheme of optical align design and the realization of receiver data processing.Considering the current widely use of virtual instrument LabVIEW programming software，the experiment uses LabVIEW programming environment to achieve the simulation of the scheme of optical align，the realization of receiver data processing，and the test for the two part.This system can be used for data reception in continuous variables quantum key distribution system.