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In order to solve the problems of low efficiency, low accuracy and high cost in existing rear suspension testing system, a field test system of suspension tools based on virtual instrument was designed. The master and server computer model, sensor fusion and wireless transmission technology were adopted in the proposed system, which could realize suspension tools multi-parameters real-time synchronous measurement. The tractor fuel consumption, emissions, drive wheel slippage rate and agricultural tool six component forces, PTO torque and rotational speeds, etc. were tested in the field under the conditions of tractor pull test platform or suspending 2BMSF-12/6 no-till dill. The results showed that the communication of field test system was normal, and the data was reliable and accurate. It satisfied the general rear suspension tools field test requirements and could provide theoretical support for design optimization and applicability evaluation.