In order to acquire the clear and exact image of the ground object

the focus position of space camera should be adjusted according to the variety of the mechanism. If the focus of the camera can be adjusted continuously in the orbit

and the optimal focus can be exactly acquired from the photos transmitted to the ground

the quality and efficiency of the space camera will be greatly improved. In order to validate the continuous focus adjustment method

a simulation and detection method is proposed. A dynamic aim generator and a collimator are applied to simulating the ground object. The computer system is used to control the dynamic aim generator

accomplish the data processing

transmit and receive the data information. The command and parameter transmitted by the simulation devices are received by the space camera at the real time

then the photos are taken and the focus is adjusted continuously and simultaneously.The experiment results show that the optimal focus can be acquired and the detective method satisfies the test requirement.