Abstract: In this research,the precise laser interferometer range of laser tracker alone is used to structure 3D trilateration network，so angular error is removed. The adjustment model is the weighted rank defect free-network and the adjustment datum is an areal datum.The approximation parameter of the orientation point coordinates is calculated with angle and distance，and a trilinear surveying method is used to get approximate station coordinates.Moreover，the station and orientation points were calculated precisely using an additional constrained matrix.The results show that the 3D trilateration net-work adjustment model can substantially raise point accuracy.