Abstract:  The establishment of regional quasi geoid with high resolution and high accuracy has become the essential condition for the construction of digital surveying and mapping system and the construction of Digital City. Especially in Topographic Map Survey and oceanographic survey, the demand of centimeter level geoid is very urgent. This paper Based on the new theoretical calculation method, the gravity field model and the fusion technology, The establishment of geoid model in centimeter class sea area is very meaningful for rapid elevation of coastal area information, and makes up for the gap of sea area.