A new method using the data sampling card and simulation technology was given to test the focusing circus of a optical remote sensor. By analyzing the theory of focuing circuit and measuring the circuit practically

the mathematic models were established for testing the focusing circuit and feeding back the value of the coder based on symbolic logic

information technology and system technology. Using the high-speed disposal and the intelligent control with PC

the testing system for focusing circuit was developed. The experimental results show that the system can exactly test the focusing circuit with work frequency less than 1.2 kHz and control voltage less than 40 V.It can satisfy the requirements for testing and simulation of focusing circuit of optical remote sensor

and the testing system can also automatically monitor the focusing circuit for a long period.