提出一种四振子对称局域共振声子晶体单元结构，通过改变振子的材料组份，使其在不同频率范围内存在完全带隙以及隔声峰；为拓宽结构隔声的频率范围，通过将不同结构复合的方式，使各结构在不同频率段发挥较好的隔声效果，从而实现隔声范围拓宽；采用有限元法研究了影响复合结构隔声效果的关键因素.结果表明，采用不同结构复合的方法能够有效地拓宽结构的隔声范围.该研究为声子晶体的宽频隔声提供了理论参考.

A local resonant phononic crystal model including four symmetrical vibrators was proposed. By changing the material components of the vibrator, this phononic crystal model could exist band gap and sound isolation peaks in different frequency range. In order to widen the frequency range of the sound isolation, a method was proposed to composite different structures. The structure plays a good sound isolation respectively in different frequency, and the composite structure can realize the widening of sound isolation range. The key factors affecting the sound isolation effect are studied through the finite element method. The results show that, the method can widen sound isolation range effectively, and the research provide an effective theoretical reference for wideband sound isolation of phononic crystals