Abstract: Technical problems remain in marine gravity data processing and anomaly calculation. In this paper we proposed a visual method for correcting gravimeter calibration error and extracting surveying-line files. Bessel method is used to calculate survey ship's velocity and course,and then do the Eötvös correction. Based on these techniques and according to the requirement of the national standard (GB/T 12763.8-2007), the authors developed a marine gravity data processing software characterized by visualization and human-computer interaction.