The invention relates to a design method for improving the laser damage threshold of a near-infrared high-reflective film, and belongs to the field of film optics, mainly aiming at a main bottleneck, namely a knot, influencing the threshold of a high-reflective film. The threshold of the knot determines the threshold of the whole film. A current technological means for improving the threshold of the film is mainly to eliminate the knob, namely, to reduce the density and the size of the knob as much as possible to increase the threshold of the film. But under current technical conditions, process difficulty to eliminate the knob is large, the cost is high and the knob cannot be completely eliminated. The invention provides a method for directly increasing the knob threshold to improve the threshold of the film. Both theory and practices prove that an electric field plays an important role for the damage characteristics of the knob, and the electric field in the knob is related to the geometric characteristics and spectral characteristic information of the knob. The damage threshold of the knob can be increased by changing designs of film systems to reduce the intensity of the electric field of the knob. The method is characterized by being high in pertinence, high in efficiency, and simple and feasible.