Hydraulic seals play a vital role in the integration of hydraulic and pneumatic components. If the seals of a hydraulic and pneumatic component product fail to pass the standard, then this hydraulic and pneumatic component product is not a good product. There are many factors affecting seals. First of all, pressure is an important reason that affects the quality of seals. The high or low pressure and the length of pressure cycle change have a great impact on seal damage (such as extrusion). The higher the pressure, the greater the influence of other factors on the performance of the seal, such as temperature, speed, seal material, clearance between the piston and cylinder barrel, and clearance between the piston and cylinder head. Another is temperature and friction. It is difficult to describe the maximum and minimum operating temperature of a seal material, because it is the result of a series of factors. As the working temperature of piston and piston rod are different, they should be selected differently. Another is the surface roughness, surface characteristics, pressure, medium, temperature, seal material, seal type and movement speed of the seal. The last one is surface treatment. Experience shows that the characteristics of the surface of the cylinder piston and piston rod have a great impact on the life of the seals. Surface characteristics are usually defined by the value of surface roughness RA, which is the arithmetic mean of the absolute value of the surface shape deviation from the centerline. However, these values do not fully represent the impact of surface conditions on seals, because even under the same roughness, different surface shape features can lead to different degrees of seal wear on seals.