Abstract: In order to study the parameter of the restriction electrode location when the working efficiency of the advance detection instrument applied in the excitat ion method was in the best time and the value selection ranging of the current strength parameter, the paper analyzed the basic principle of the excitation method adva nce detection technology. The coal ( rock) in the front of the mine gateway driving face as an unchanged system in linear was applied to establish a mathematic model of the driving face electric field. The scalar electric potential functions of a location in the front of the driving face were listed and the conception on the restriction efficie ncy of the electric filed.Due to the Matlab Software application, with the comparison and individual collection of the different value as well as the restriction efficiency ηe iand increased variation law Oηe, the paper analyzed the electrode location parameters and the current strength parameters and the influences to the detection scope. The obtained valueb and the optimized valuek would be 3 m and 2.0 ~ 2.5 respectively. At this moment, the working efficiency of the advance detector would be the hi ghest.