The sea- land transition zone is a complex and intersecting geographical unit, and is the area with the most superior resources and environment conditions. It is of great significance to integrate airborne gravity and ground gravity to form continuous gravity field data for resources and environment assessment of sea- land transition zone. In this paper, Rizhao- Lianyungang sea- land transition was selected as the demonstration areato carry out the research on the fusion of airborne gravity data and ground gravity data.Through data sorting and comparative analysis,the determination method of system difference between data is summarized, and anevaluationmethod of consistency and difference between airborne gravity and ground gravity is put forward, and the consistency and difference between data are quantitatively evaluated in two forms of section and plane respectively;Base on the quantitative evaluation of data, plane root mean square error method is used to evaluate the blend method and suture method respectively, which provides a quantitative basis for the selection of data fusion methods.The research results show that the airborne and groundgravity data in Rizhao- Lianyungang area have good consistency. The consistency coefficient range is 0.81~0.99 in profile, and the consistency coefficient is 0.95 on the surface.The comparative test shows that the seam method is better for the air ground gravity data fusion in the sea land transition area, and the gravity number after seam fusion is adopted. The standard deviation between the fusion data and the original airborne gravity data is 2.63×10 -5 m/s 2 ,and standard deviation between the fusion data and the original ground gravity data is 0.98×10 -5 m/s 2 ,which achieves good good fusion effect. The airborne gravity and ground gravity data fusion in Rizhao- Lianyungang sea land transition area provides a reference for similar areas to carry out multi- source gravity data fusion.