The system,mainly controlled by the minimum system which consists of the single-chip microcomputer and FPGA,is based on the principles of GB3442-82standard to achieve the function of parameter measure for integrated operational amplifier(IOA).Via program controlled amplification and accurate adjustment of amplification,the system achieves the measurement of VIO,IIO,AVD,KCMR(the error is2%and±2dB)and BWG and it switches the range automatically.By means of human-computer interaction interface,such as keyboard and display,the system displays the information of measurement accurately and expands the functions of touch-screen control and printing.