Abstract: In the study of digital auralization,a special computer model should be set up to simulate the impulse response of an enclosure.In previous studies,behaviors of indoor barriers have not been fully investigated.This paper presents different methods for simulating the behaviors of various barriers including screens,a small number of irregular barriers,an intervening wall and a lot of disorderly placed barriers.Corresponding algorithms are developed based on the ray tracing technique and statistical method.Phenomena such as specular reflection,diffused reflection,scattering and transmission have been considered.These algorithms are testified by simulation of a complicated model.