Abstract: This paper deals with the determination of the sea level height and sea surface topography in the china sea and neighbour by TOPOX/POSEIDON(T/P) satellite altimeter data.The data of T/P 59~82'cycles covering 83^th~311^th days in 1994 are processed.The data of 59~82 cycles are divided into two parts,which have respectively been used to estimate the sea level height and to analyze the sea level changes.The obtained results are compared with the sea level heights estimated by Basic and Rapp in 1992 Using the combined solutions of Geos-3,Seasat,Geosat,and ETOPO5U bathymeter data.Results of the 30'×30' mean sea level heights are obtained by the Shepard curve fitting method.Taking respectively the OSU 91 and the WDM 94 earth gravity field models as the reference gravith field,the 30'×30' mean sea surface topography is computed.