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According to the requirements of port management system, all fishing vessels must stop fishing and return to their registry ports during the summer fishing moratorium. Fishing vessels are not allowed to dock at the non-registry port. In order to investigate the fishing vessels docking at other provinces or cities’ ports which are not their registry ports during the summer fishing moratorium, a method to extract the off-site docking information of offshore fishing vessels based on Beidou navigation satellite system position data was proposed in this paper. First of all, we need to find out the time periods during which the fishing boat stoped sailing, and then selected the longest time period and obtained the longitude and latitude of the location where the boat stoped during the longest time period. The reverse address query web service provided by Gaud map was used to obtain the provinces, cities and districts based on the longitude and latitude. Then compared the docking address with that of registry ports to determine whether the vessel was off-site docked. Taking Zhejiang Province of China as an example, the fishing vessels positions data of vessel monitoring systems based on Beidu Navigation Satellite System was used to extract the off-site docking information and conduct statistical analysis. The results showed that 2.75% of fishing vessels docked across provinces, 5.86% of fishing vessels docked across cities in the province and 15.6% of fishing vessels docked accross district in the city。This method can quickly extract and count off-site docking information of fishing vessels, and provided technical support for fishing vessel's management information during the fishing moratorium. [ABSTRACT FROM AUTHOR]