Aiming at improving the limitation of traditional 3D coordinates measurement,the use of digital camera images to achieve 3D reconstruction is brought forward.This is a new type of nontouch measure ment.Standard graphics method is introduced to solve the calibration of camera's interior and external parameters.Compared with traditional calibration method of camera,it greatly reduces the complexity of the solution.Then the theory and algorithm about 3D reconstruction is described,which is based on two digital camera images of an object.Finally,a realized example and its steps of 3D reconstruction are presented.