Based on the target reflection section defined by The Bidirectional Reflectance Distribution Function,a method of approximate calculation and analysis of the cone and plate′s reflection section in laser-illuminated condition are derived in the paper.With the method,calculated and analyzed reflection section of cone.Experimental platform was established with 1.319 μm Nd∶YAG laser,measured the reflection section of cone in diverse incident angle.Curve of the plate,cylinder and cone relative illumination changing in diverse incident angle were measured.The results of this study are help for many applications such as weapon designing,target invisible,and system modeling.