Based on the RMERS’s (self-reconfiguration modular exploration robots system) working principle and its child-robot’s motive mechanics, this paper researched the RMERS’ climbing step capacity in detail. For a child-robot,the method of exerting reverse velocity and planning its arm’s pose were adopted to make it climb up the step smoothly,thus the child-robot’s overstepping ability was strengthened. New robots system composed of some child-robots greatly expands the single child-robot’s circumstances adaptability.All configurations of the child-robot were analyzed,it is concluded that the loop connection is the best form in climbing step, and that decision-making method according to circumstances was put forward. When the step obstacle is little, the new system will overstep altogether,on the contrary, the strategy for sending a single child-robot pass to carry out the exploration role is adopted. At the same time, according to the static analysis, this paper analyzed the biggest step for the single child-robot and their connected system respectively. The corresponding experiments validate the analyzed results.
