根据声学波动理论，首先提出了封闭空间内对单极子声源的局部有源消声方法，指出当次级声源与传声器距离较近时才能达到较好的消声效果。在此基础上，对多次级声源共同作用时，各次级源强度及消声效果进行了推导。最后给出了计算机仿真结果。为局部消声控制器的设计提供了依据。 According to the theory of acoustic wave, a local active muffler method for monopole sound source in a closed space is proposed first, and a better muffling effect can be achieved when the distance between the secondary sound source and the microphone is relatively close. On this basis, the strength of each secondary source and the effect of noise reduction are deduced when the multiple secondary sources co-operate. Finally, the computer simulation results are given. Provided a basis for the design of local muffler controller.