In order to meet the development of agricultural machinery and the need for real-time testing of multiple dynamic parameters, three-points hanging type measuring force device was developed on the basis of principles of relative test devices, combined with three-pin summing circuit and measuring force pin with universal three-points hanging mechanism on agricultural machinery. According to the characteristics of selected sensors, and on the LabVIEW developing platform, a field test system on dynamic parameters for high-power suspension agricultural implement was developed. Suspension implements of displacement, power output axis speed and torque, output power, level traction, fuel consumption and other parameters were tested. Type CTM-5000 comprehensive field test system was developed. The source of systematic errors was analyzed. The way of avoiding the errors was found. With the front and rear of tractor supporting farm implements for a test object and comparing with the existing similar test system, results showed that the measurement data were reliable and easy to be operated. The system showed feasibility and advantages of this new design. 