Theodolite measuring system has been w idely used in engineering measurement due to its wide measuring range,non-conta ct measuring type and portability.However,due to the limitation of the spatial a ngular resolution of the theodolite,it is very difficult to ensure the "collimation axis" of the theodol ite aim at the target point accurately with the increase of the measurement space and size.So measurement result is prone to er ror.In order to reduce error,a method of precise intersection of laser theodolites was put forward based on "co llimation axis" visualization of the laser theodolite.Firstly,we leaded the theodolite to take array scanning around the ta rget point by the minimum step angle and obtained the position relations of the scanning points coordinates and the t arget point coordinates according to image acquisition and image processing.Then,through linear fitting and coordinat e calculation,we implemented the "collimation axis" of the theodolite aim at the target point accurately.Finally ,we designed experiments to verify the feasibility of this method.The experimental results show that this method can a chieve the precise intersection of the laser theodolites and greatly reduce the measurement error of the theodolite mea suring system.Also,this method can reduce the theodolite manufacturing costs.