The design in this paper aims to make periodical deflection with FPGA controlling galvanometer to achieve laser linear scanning, and to replace digital oscilloscope with data acquisition card to collect photoacoustic signals. DAQ card based on VC has flexible control of the data acquisition of the photoacoustic signal, the system timing is under the control of FPGA. The experiment has proved the feasibility of deflected scanning of galvanometer and the data acquisition card. This scheme can efficiently improve the current situation that the existing photoacoustic imaging systems in labs can only achieve linear scanning with manual adjustment of stepping motor, it is able to collect the available photoacoustic signal in the light of its own demands, and it also provides basis for the implementation of integrated photoacoustic imaging system combined with the acoustical lens in post production.