A　new　continuous　variable　phase　detection　platform　was　built.　In　the　proposed　platform,　electro-optic　modulator　was　used　as　the　transmitter　to　produce　continuous　phase　shift,　homodyne　detection　circuit　was　used　as　the　receiver　to　measure　the　phase　of　the　light　field,　and　high　performance　NI　data　acquisition　card　PCI6111E　was　used　to　control　the　entire　system.　The　LabVIEW　program　technologies,　including　PID　control,　DAQmx　data　acquisition　and　triangle　fit,　which　can　reduce　system　development　time,　were　used　to　improve　the　programming　efficiency.　The　feasibility　of　the　continuous　variable　phase　detection　system　was　validated　by　Jones　matrix　theory　and　experiments,　which　shows　the　cosine　relation　between　the　output　voltage　of　homodyne　detection　and　the　input　voltage　of　phase　modulator.　The　new　scheme　provides　a　new　approach　for　continuous　variable　quantum　key　distribution.