Based on coherent optical communication theory, experimental setup was designed to build a homodyne coherent optical detection system platform. PCI6111E from National Instruments corporation is used as a data acquisition module for its high performance. The sender and receiver control software on different computers were designed under virtual instrument environment LabVIEW. Experimental results show that by use of light-synchronization and LabVIEW software control, acousto-optic modulator, electro-optical modulator of sender, data acquisition of receiver and phase regulator based on piezoelectric ceramic can work together in cooperation, and coherent optical information modulation on sender and real-time demodulation on receiver are realized.