1. To allow the lubricating oil to enter the friction surface smoothly 2. The lubricating oil should be introduced into the bearing from the non-load bearing area 3. Do not allow the full ring oil groove to open in the middle of the bearing 4. The joint of the split bearing bush should open an oil groove 5 . To make the oil supply to the oil ring fully and reliably 6. Do not block the oil filling hole 7. Do not form a no-flow area for lubricating oil 8. Prevent sharp edges or edges that cut off the oil film 9. Step wear occurs 10. Do not make the thrust of the bearing bushes The end face is in line contact. 11. The thrust bearing and the journal should not be in full contact. 12. The starting of the high-speed rotating shaft of the heavy-duty large machinery requires the bearing of the high-pressure jacking shaft system. Hollow out in the middle of the contact surface with the bearing bush 14. Do not cause the situation that the bearing bush or bushing cannot be assembled or disassembled 15. Reduce the edge pressure generated by the support bearing of the intermediate wheel and the cantilever shaft 16. When the bearing seat hole is not concentric or after being loaded Under the condition of deflection and deformation of the axis, the self-aligning sliding bearing should be selected. 17. Relative movement is not allowed between the bearing bush and the bearing seat. 18. The two metals in the bimetal bearing should be firmly attached. Clearance required for thermal expansion during operation 21. Consider the clearance adjustment after wear 22. Cylindrical bearing bushes used under high-speed and light-load conditions should prevent instability 23. Bearings with high-speed and light-load conditions should choose bearings with good vibration resistance 24 .Oil-impregnated bearings are not suitable for high-speed or continuous rotation applications. 25. Sliding bearings should not be combined with sealing rings.