As an important part of the modernization of national governance ability, legislative ability represents as the comprehensive quality, condition and level of legislative bodies' ability to complete legislative tasks and achieve legislative goals. The level of legislative ability is subject to many factors such as legislative corps, legislative body and legislative mechanism. With deepening reform and particularly with implementation of a new legislative law, the demand for ethnic regional autonomous legislations increases greatly and the conflict between huge legislative tasks and insufficient legislative ability arises sharply. To solve problems with the development of ethnic regional legislative ability in Sichuan province, great efforts should be made to improve legislative mechanism and system, enforce legislative corps, develop special legislative bodies, and provide more guidance for local legislative work.