Abstract: The characteristics of shipborne gravimetric data from offshore China were analysed，and a method to eliminate systematic deviation in the gravity for different survey lines located in different regions is also proposed. A criteria for determining shipborne gravimetric survey lines for base lines is presented，and the residual disturbance gravity at the cross point between two different survey lines on the base line was used to rectify the other values for different shipborne gravimetric survey lines. These experiemental results show that，in accordance with the criteria presented，when correcting the gravity of the survey line in the proposed method the gravity value difference on different lines does not include a systematic bias，the intersections of discrepancies significantly improved，and the survey lines to correct the gravity disturbance were significantly better than those without pre-corrected gravity disturbance.