With the purpose of promoting the feasibility of effectiveness estimation on laser angle deception jamming to semi-active laserguided weapon, a new method is proposed. A comprehensive evaluation index system is constructed that is composed of alarming success probability, time domain correlation, wave length consistency, spatial correlation, coding matching degree, model matching degree as well as interference-to-signal ratio (ISR). On the basis of this evaluation index system, the models of calculating the induced success probability and decline of kill probability are built. The basic flow of this evaluation method is introduced briefly, and a jamming effectiveness evaluating case is carried out by means of the method proposed by this paper. Furthermore the influences of main indexes on the jamming effectiveness are analyzed, and the results show that the jamming effectiveness could be improved by shortening the jamming reaction time, raising the coding matching degree, enhance the jamming power and increasing the model matching degree.