Abstract: For problems that non-automatic control mode of single support has low efficiency and speed of sequentially automatic control of grouped single support is slower than coal-cutting speed in PM31 electro-hydraulic control system of hydraulic support, the paper put forward a scheme which can realize synchronously automatic control of grouped multi-hydraulic supports by use of original program in controller of hydraulic support of the system, namely interconnecting controllers of every support through main cable and terminal to control electromagnetic and electro-hydraulic driver to make grouped supports act synchronously according to data of travel sensor of support advance and pressure sensor of column. The practice showed that the scheme has good application effect and improves stopping efficiency of fully mechanized coal face.