A high precision hydraulic force calibration system was developed, and the Best Measurement Capability(BMC) was evaluated for the system with maximum load capacities of 100 kN and 500 kN, respectively. The calibration system consists of mechanical frame, hydraulic loading and contol system, reference force transducer, automated operating software, and data acquisition and analysis software. In addition to the conventional servo-controlled hydraulic system, a specially designed precision pressure controller was developed for minute load control during holding period at each load step, the control stability which is 0.0005% for 2 mV/V of the reference force transducer's signal. The BMC of the 100 kN force calibrator is less than 4.28 × 10~(-4) in range of 20～100 kN, and that of the 500 kN force calibrator is less than 3.81 ×10~(-4) in range of 50～490.3 kN.
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