Abstract: With the exploration of gas hydrate in China going forward to the phase when field test drilling is carried out, the accuracy of navigation and positioning has to he improved to identify gas hydrate more accurately and describe its outer conformation and distribution characteristics more precisely so as to determine where gas hydrate exactly exists. In normal gas hydrate investigation, navigation and positioning accuracy can be greatly improved by means of different methods such as positioning network configuration, error analysis and data post processing based on the particularity of single streamer and single source pseudo-dD seismic survey. These methods have been proved to be of significant effect on practical field seismic data acquisition and will provide effective technical support for the discovery of gas hydrate in China.