In the distribution network, the stability and flexibility are limited due to intermittent distributed power and loads. For scattered factory and residents, single-ended voltage fluctuation control equipment can’t meet the requirements. This paper studies the Flexible Multi-State Switch (FMSS) voltage fluctuation control technology for multiple feeder interconnections. Based on topology analysis, the power exchange principle is analyzed between FMSS and three-terminal feeder. The decoupling control strategy is used to realize active power flow and reactive power compensation independently. The simulation model is built to verify the above two functions. Then the multiple control is realized by the reactive power coordination control optimization model. Simulation and optimization results show that the switch model is fast and effective. This work is supported by National Key Research and Development Program of China (No. 2017YFB0903100) and Science and Technology Project of State Grid Corporation of China (No. 521104170043).