In order to achieve high precision,real-time and good reliability of position sensitive detector(PSD)in ATP system of satellite-earth communication,measurement accuracy and error correction system of PSD were designed based on LabVIEW.Firstly,the laser light source was driven by a stepper motor.The voltage value was obtained and the spot position was calculated by scanning the PSD photosensitive surface,and the cause of nonlinear error was analyzed.A mathematical model was built between the real value and the measured value by using binary quadratic polynomial method,and nonlinear correction function was gotten.Then,the micro displacement and angle of the target were measured by combining optical triangulation method,and the errors of the measurement results were corrected.Experimental results showed that,the measuring errors could be significantly reduced after the correction and meet the requirements of the system.The efficiency of the system can be improved greatly by using LabVIEW.