Abstract:Based on GNSS differential phase kinematic positioning program of GAMIT TRACK, tidevariation is calculated using GNSS observation date of yellow sea near QingDao. IGS final ephemeris is involved to achieve GNSS high[CD*2]precision ocean tide observation, which is compared with recorded values of pressuretidegauge after. The observation data of QDCORS sites and SHAO of IGS sites is combined with a kinematic site to form six kinds baselines of different length, which are used to verify the operating distance of track program.