Tribology is defined as the science of interacting surfaces in relative motion. The tribology behaviors happened in tribosystem shows some characteristics, such as the sensitivity on the initial condition, instability and randomicity in the running process, abnormity in time and in the space. All of these features support that tribosystem is a very complicated system. Its complexity decides its diversity in its description. Therefore, it is necessary to use system-analysis method in the study of tribosystem...