The　PGC　homodyne　demodulation　technology　is　used　frequently　to　demodulate　sensing　signals　from　interferometric　Optical　fiber　hydrophone.　However,　it　is　difficult　for　the　system　to　achieve　the　optimum　performance　because　the　electronic　components　which　constitute　the　analog　circuit　of　the　PGC　homodyne　demodulation　system　have　some　problems　such　as　overload,　improper　resistance,　etc.　For　overcoming　these　disadvantages　of　the　analog　circuit　mentioned　above,　a　digital　PGC　homodyne　demodulation　system　based　on　LabVIEW　platform　is　developed　in　this　paper,　it　is　proved　that　the　digital　PGC　homodyne　demodulation　system　has　good　stability　and　practical　feasibility.