Torque standard machine is a standard instrument for the transmission of torque value, which is mainly used to calibrate high precision torque sensors. The uncertainty of the repeatability value is an important guarantee for the application effect. At present, most of the lever parts of the torque standard machines in China and abroad adopt the knife-edge and knife-bearing support method or the integral air-bearing support based on small hole throttling principle. By analyzing the limitations of the two support structures, a new type of lever support is designed and optimized. The system adopts a combined static pressure air-bearing to support the lever, which effectively controls the friction torque while reducing the difficulty of realization and the failure rate, thereby realizing the improvement of the performance of the whole machine. At the same time, the combined structure can also improve the moment arm-lever into a single-beam double-arm symmetrical frame structure, so that the measurement accuracy of the moment arm-lever can be effectively guaranteed on the basis of reducing the difficulty of lever processing and assembly. Based on the Fluent software, this paper conducts fluid simulation of porous static pressure air bearings, studies the influence of air supply pressure, porous material permeability, and thickness of the bearing body on their static performance, and provides theoretical basis and data support for the selection of bearings.