The trade unions should explore new ways to serve the workers in the context of "Internet +". This can help the trade union to further clarify the working mechanism and service mode in the new era. It can also enhance the cohesion of the organization, which providing better service. But now there are some problems, including the overall planning is not clear, lack of information sharing, insufficient use of data. At present, a mobile internet service platform in national union level should be established. It can achieve information exchange, resource sharing, promote social harmony, provide employees with more accurate, deeper and more long-term service. The subject of this platform is mobile internet application (App). It focus on service, interaction and comprehensive information analysis and publication. The construction of the application need deep participation with the trade union work staff and technical personnel.