Abstract: Based on the analysis of traditional navigation methods,we study underwater geomagnetic navigation method based on ICCP technique in detail.By the analysis in theory and the comparison in real applications,we get an optimum model,which is multi-curve function model and can improve efficiently the accuracy of building geomagnetic field model.Then,we study the technique of interactive cosest contour point(ICCP)in theory and give out a completed procedure for geomagnetic navigation.In order to make the method strong practicability,we also analyze the factors,which influence the accuracy of underwater geomagnetic navigation.Finally,we give out conclusions and a lot of suggestions.