关键词: 声线跟踪, 室外声场, 脉冲响应

Abstract: Most of the sound field simulation focuses on researching the impulse response in closured sound field，and then calculates other sound parameters，due to various environment in outdoor sound field，there is less research.A model of the outdoor sound field in virtual environment is constructed on the basis of the algorithm of ray-tracing in this paper，then an algorithm of step-length by defining the receiver dynamically is proposed，considering the outdoor sound field in environment，the impulse response in different positions are calculated.Then the algorithm proves the effectiveness.

Key words: ray-tracing, outdoor sound field, impulse response