The field of view of Laser irradiation and imaging detection need to be changed in step in laser active imaging system. Two control methods are presented, which are laser waist focus-object adjustment and zooming adjustment forlaser transmitting objective lens. The control formulas are derived from the transformation formula of thin lens for fundamental mode Gaussian beam, which can be applied to method design of field of view sychronzition control. The results of numerical calculation for control formulas show that the control methods are valid. In order to make the adjustment control range and step be satisfied with the real design requirement, the parameters of laser waist focus-object adjustment, laser divergence angel and focal length of laser transmitting objective lens are need to be considered synthetically when designing. The control method of zooming adjustment for laser transmitting objective lens is easier to be carried out than the method of laser waist focus-object adjustment in terms of design difficulty.