With the development of smart substation, the integration level of substation secondary equipment is also increasing. In order to achieve the integration of three-state data (steady, transient, dynamic states) collection equipment on grid, the paper provides the method of three-state data comprehensive collection, i.e. the data acquisition equipment of distributed three-state data by smart substation intervals, station bus or process bus GOOSE network, and the data concentrator module of SCADA constitute the three-state data comprehensive collection system, and makes a detailed description of their function assignment. The paper details the research and design of three-state data collection equipment and solves the problem of transient data complete collection by GOOSE communication. Finally, the feasibility of the program is verified by specific test. Compared with the traditional three-state data comprehensive collection system, the program has obvious advantages in flexibility and economy.