In order to improve the efficiency of testing SLD light source, we study the four channels driving technology based on the SLD light source driving technology. Contraposing the problem with which the four channels driving circuit are faced, such as power supply, system volume, faceplate display, channel consistency, etc. We put forward corresponding technology or methods. The feasibility and reliability of the technology and methods have been confirmed. These results may provide reference for the design of much more channels SLD driving circuit and similar circuit system.