In response to the shortcomings of current satellite systems such as limited functionality，inability to quickly obtain multi-dimensional regional and target information，a cluster formation satellite model and a constellation system is proposed for complex space-based information support missions with the requirements such as high timeliness，all day，all weather，multiple means，and having the abilities of both large scale search and regional detailed investigation.Multiple small satellites of different types are designed to achieve multi-means collaborative detection and verification through intra-cluster satellite collaboration，and continuous updating and timeliness of space-based information are achieved.Multiple collaboration modes for the formation system are designed，e.g.，guidance collaboration，regional splicing collaboration，multi-means collaborative identification and confirmation，and relay continuous observation collaboration.Furthermore，the mission planning methods corresponding to the application scenarios such as guidance collaboration and relay collaboration are conducted.This effectively alleviates and solves the huge challenges that traditional single satellite implementation of complex missions brings to satellite and rocket design，and provides a low-cost，feasible，and flexible application scheme，laying a foundation for the comprehensive application of satellite cluster formation systems.