In order to finish laser signal capture,a typical development system block diagram is provided. Its signal capture and data transfer subsystem is described in detail,some important modules design and state machine shift are presented. D/A module finishes pre-amplifier adjusting-zero before capturing laser signal. A/D module controls laser signal capturing-data timing,and send capture data packets to the computer by serial port. Serial port module is used to receive instruction from computer and sends data to computer. Experimental results indicate that this design can satisfy the system requirements of realizing pre-amplifier adjusting-zero,transfers data to computer by serial port at the speed of 115200bit/s,and accomplishes 200 frame data per second.