L D M-5 1 intelligent open channel flow measuring system (full channel wide box type electromagnetic open channel flow meter) is the only intelligent measuring device that can directly measure the average flow speed of the overflow section. The whole channel wide box electromagnetic open channel flow meter adopts the flow speed-area method, consisting of the whole channel wide electromagnetic flow speed sensor, liquid level sensor and intelligent converter. The working principle is to calculate the section area measured by the area of the channel. The water level of the level meter with different principles, the liquid level meter is generally measured by ultrasonic level meter, pressure level meter, etc. The measurement system can realize precise flow control function by combining gate, solar control system and wireless communication remote control, which is the basis of gate linkage control and information solution in irrigation area.