In advanced manufacturing methods, electric spindle functional components with high speed and high precision are required in machine tools. In order to make the electric spindle of turning machining center have high stiffness and rotary precision at high speed, the hybrid bearing was chosen as the spindle support form. Bearing with four circumferential oil cavity structure selected, and orifice throttling constant pressure oil supply form was chosen.A lubrication analysis model was established to analyze the bearing capacity, minimum film thickness, temperature rise and other static performance indexes. The dynamic performance of the bearing was tested on a horizontal test bench. The test results show that the stiffness of the bearing increases with the increase of the speed, and the stiffness is relatively stable under the speed of 3 000~6 000 r/min; the maximum amplitudes in horizontal direction and vertical direction are 4.5 μm and .9 μm respectively. To improve the rotary precision, the rotor shafting system can be optimized, and dynamic balance and vibration isolation should be done well.