以三角晶格空气环光子晶体线波导结构为研究对象，分析了空气环散射元内半径R_in和外半径R_out对波导慢光特性的影响，结果表明R_in/R_out的值在0.15~0.35之间时，能够获得宽带慢光，而且邻近波导两侧首排空气环的外半径R_fout相对于其内半径R_fin对慢光特性的影响更大。当波导两侧首排散射元为空气孔时有利于慢光群速度的降低、为空气环时有利于获得更宽的带宽。当波导两侧首排散射元由空气孔和空气环交替排布构成新型非对称线缺陷波导结构，同时具有了两类散射元的优点，它的群速度与带宽特性优于对称型波导，实现了群速度为0.0086 c、波长范围为6.588 nm 的低色散慢光。

The line defect waveguide structure of triangular lattice photonic crystal with air ring is studied. The influence of scatter inner radius R_in and outer radius R_out on the slow light properties is studied. These results indicate that the ratio of R_in/R_out in 0.15~0.35 is favorite to obtain the broadband slow light. The outer radius R_fout of the air ring rows next to the waveguide channel has the more impact on the properties than the inner radius R_fin of the air ring rows next to the waveguide channel. The air holes scattering element on both sides of the waveguide are benefit to reduce the group velocity, while the air rings are helpful to get wider slow light bandwidth. However, the ideal slow light phenomenon is obtained in the asymmetric line defect waveguide which is combined air holes with air rings. The group velocity 0.0086 c which has low dispersion is obtained with the wavelength range of 6.588 nm.