Abstract: Matched field processing approach is applied to a single vector hydrophone for 3D source location in this paper.According to pressure and particle velocity's expressions,the single vector hydrophone's Bartlett expression is deduced and analyzed.Then simulation is made on it and the analyzed results are described as follows: pressure method can achieve range and depth location but not distinguish angle;pressure-axial velocity-normal velocity combination can distinguish angle without left/right ambiguity problem but have much worse performance of range and depth location than pressure method;axial velocity-normal velocity-vertical velocity combination can also distinguish angle without left/right ambiguity and have little better performance of range and depth location compared to pressure method.So,axial velocity-normal velocity-vertical velocity combination needs to be used for a single vector hydrophone to achieve 3D location.