Abstract: Ultrasonic Lamb wave method is a common way to detect the structural damage of plate structure. However, the anisotropy of carbon fiber reinforced plastics (CFPR) material properties has a greatly effect on the accuracy of Lamb wave based damage imaging and location. Most detection methods use the detection signal of health structure as the reference signal, and use the difference signal method to realize the damage imaging, however, the detection is easy to be affected by the changes in the structure to be tested and the experimental environment. To solve this problem, a combination of time reversal and weighted distribution imaging is applied to detect the damage in composite sheet materials by Lamb wave. The simulation results show that the method can effectively realize two-dimensional imaging and localization of single delamination damage, multi-delamination damage in the plate with high accuracy.