Gravity/inertial matching navigation is an integrated navigation method which uses the earth gravity field information to correct the inertial position matching. In matching navigation，the spatial resolution error is caused by the spatial resolution difference between gravity measurement information and gravity database information. In this paper，a spatial resolution synchronization technique is proposed to reduce the spatial unsynchronization error in matching navigation. The spatial resolution synchronization technique calculates the spatial resolution of the gravity measurement information through the carrier motion information and the parameters of the gravity measurement algorithm filtering model，and reduces the resolution of the gravity database through the two-dimensional filtering. The information of gravity measurement is synchronized with the information of gravity database. After the spatial resolution of the database is modified，the matching navigation algorithm is used for matching location. The location accuracy of the improved matching navigation algorithm is 1.1 nmile higher than that of the traditional matching algorithm. The spatial resolution synchronization technology can improve the positioning accuracy of gravity-matched navigation，which will be helpful for the development of gravity-matched navigation equipment in the future.