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Aiming at the ‘in-to-out error’ and ‘out-to-in error’ caused by boundary effect in approximate point-h-triangulation test three dimension (APIT-3D) algorithm for wireless sensor networks (WSNs),which leads a bad location precession,this paper proposes an improved APIT-3D scheme based on volume-test,named volume test approximate point-in-triangulation test three-dimension (VT-APIT-3D) algorithm.By adding the advantage of comparing to the volume of the triangular pyramids in process of point-in-triangulation test (PIT) during APIT-3D,the unknown node can be accurately determined whether it is in the testing triangular pyramid or not.This method can remove the probability of the ‘in-to-out error’ and ‘out-to-in error’ in APIT-3D.Finally,the simulation results confirm that the proposed scheme has great advantage in aspects of localization accuracy in comparison with original APIT-3D scheme and relational scheme respectively.