Abstract: In order to reduce the complexity of design and capital investment,improve the reliability of system operation,reduce the workload and time of commissioning and maintenance personnel,and reduce the number of spare parts,the turbine supervisory instrument（ TSI） system can be integrated with the main control system. Taking a project as an example,it introduces the integration of TSI and distributed control system（ DCS）,explaining the working ideas,software and hardware conditions,and the handling of some problems in the commissioning process. At the same time,the integration of instrument control and the modification of corresponding regulations are proposed.