The nano-effects of nano-Cu lubricating material in equipment maintenance were researched from reducing friction effect, antiwear effect and repairing effect by comparing tribology properties of nano-Cu lubricating material with micro-Cu material. The nano-effect mechanism was discussed. The results indicated that the reducing friction effect and the antiwear effect can make the friction coefficient and the worn track width of lubricant reduce to 16% and 40% respectively. The repairing effect can make the nano-Cu lubricating material forms repairing film on wore surface. That of all is decided by the characteristics of nano-Cu lubricating material.