Abstract: Surface texture with different parameters was carved by precision mechanical engraving technique on the surface of Plunger. The lubricating properties of plunger-NBR seal tribo-pairs of micro-dimple with different size and shape were investigated in hydrodynamic lubrication by using a MDW-100 computer controlled tribometer. It is found that the reasonable surface texture parameters significantly improved lubrication and antifriction characteristic of fracturing pump plunger-NBR seal tribo-pairs. Regularly distributed cylindrical and rectangle mixed textures with an area ratio of 5.86% had obviously lower friction coefficient, temperature rise, wear than that of the non-textured ones. The decreases of friction coefficient, temperature rise, wear were 80%, 90% and 79.3%, respectively.