Abstract: After improving the circuit of ZHT-03 mass spectrometer and using the cards of data acquisition and application software, the continuous accelerating voltage scanning control and the data acquisition were achieved. Furthermore, the real data, diagram, analytical state and results were displayed dynamically， and all the information of samples were stored as excel format. The results of standard samples show that the precision and accuracy are enhanced to 0.149%, 0.27% from previous 0.5%, 1.5%， respectively. As a result, the performance and the degree of automation of mass spectrometer are improved greatly.