Abstract: As a type of bionic robot with distinct construct and inventive concept, it can transfer gravity, which is usually an obstacle in other mechanics, to be a propelling force by taking advantage of dynamic interference force and such forces as those between linkage and ground surface. Moreover, the robot can imitate animals to fall down, stand up without shock, move peristaltically and ascend a step. These functions have important sense. The paper discusses its moving theory and mechanics.