Gas-field information is distributed, heterogeneous and cross-platform, traditional C/S mode can not meet the needs of information integration and sharing. The combination solution of concentration and distribution of information integration is presented. Mobile agent technology is introduced into information integration of gas fields, hierarchical model based on mobile agent is proposed. Functions of agents in each layer are analyzed in detail, as well as agent workflows and implementations. The application of the data integration platform to digital gas-field shows that the MA system is highly general, open, flexible, and can provide a new method and template for distributed application integration in other industries.