The legal aid work of trade unions is an important component of the national legal aid cause. The innovative development of legal aid system of trade unions is not only an inevitable requirement for implementing the central government's decisions on the reform and deployment of mass organizations, but also a major measure to implement the provisions of the law, strengthen the work of trade unions to serve workers and safeguard their legitimate rights and interests, and safeguard the workforce and stability of society. It is of great practical signifi cance. Over the years, especially since the reform of masses, outstanding results have been achieved in the construction of the legal aid system of trade unions, but problems also exist such as insuffi cient awareness of ideas, the urgent need to strengthen the team building, the operation mechanism to be improved, and the insuffi cient fi nancial security. It is suggested in the study that the legal aid system of trade unions in the new era should start from the toplevel design, improve the coordination mechanism, cultivate the talent team, innovate the working mechanism and broaden the funding channels, etc., for its innovation and development.