The quality of bubble image is determined by the efficiency of underwater optical system in ship wake detection,while the illuminating source is an important factor that affects the performance of the underwater imaging system.A new sheet laser source is proposed in order to solve the problem,and the utilization rate and feasibility are analyzed and proved.The test results show that the new illuminating source can not only solve the lighting of the imaging system,but also avoid excess images overlapping within the depth region of the optical field.The proposed light source creates significant terms for acquiring the parameters of the bubble curtain.This new design can be used in under-water optical systems because of its unique advantages.