For high precision size measurement of parts,the synchronization of linear array CCD camera image acquisition and parts movement is researched.The synchronization method using servo motor and motion control card is analyzed,and a control method is proposed with asynchronous motor and encoder.The relationship between the motion control system and the camera line rate is studied,and synchronization control of unequal step is designed.According to image acquisition characteristics of linear array camera,diameter parameters on chip direction and motion direction of a standard circular target is extracted,realizing calibration of object image ratio and interpolation correction factor.A linear interpolation algorithm is designed that any shape of the target imaging can be corrected according to correction factor.Experimental results show that the method can effectively correct image deformation of tension for linear array CCD with low cost.