One-button sequential control is one of the advanced applications of the intelligent substation, which is the key technology to promote the deep integration of modern information technology and power grid technology and to construct intelligent operation and inspection systems. Traditional switching depends on manual operation and has a great risk of misoperation. The application of one-button sequential control can effectively reduce misoperation and improve the safety level of power grid switching operations. Through the analysis and research on the key technology of one-button sequential control and combined with the action characteristics and position requirements of the moving contact of disconnector in the opening or closing process, the test analysis method and test control technical requirements of the one-button sequential control are put forward, which provides a certain technical basis for the control and design of the one-button sequential control in the future.