The tribological properties of ultra-thin ionic liquid films (IL films), a promising lubricant, were evaluated using a Universal Micro-tribometer-2MT tester. The morphologies of the wear tracks of the films and the counterpart surfaces were examined. The tribological performances of IL films were closely related to the chemical characteristics of the substrate surfaces. The Zdol-2000 film recorded high friction coefficient and very short anti-wear life. The friction coefficient was ∼ 0.1 and the duration time before failure was only 144 sec. The calculated anti-wear life was only 3000 cycles corresponding to a sliding distance of 17 m. The results of IL films on vinyl-terminated substrates were similar to the films on hydroxyl-terminated substrates. There was strong interaction between the film and the hydroxyl-terminated and vinyl-terminated substrates. Tribological behavior of IL films on hydrogen-terminated substrates was relatively poor. It could only sustain a few hundreds of reciprocating cycles. This is an abstract of a paper presented at the World Tribology Congress III (Washington, DC 9/12-16/2005).