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Developing autonomous mobile robot system has been a hot topic in AI area. With recent advances in technology, autonomous robots are attracting more and more attention worldwide, and there are a lot of ongoing research and development activities in both industry and academia. In complex ground environment, obstacles positions are uncertain. Path finding for robots in such environment is very hot issues currently. In this paper, we present the design and implementation of a multi-sensor based path finding autonomous exploration robot system, 2RE, with the VEX robotics design system. With the goals of path finding in complex ground environment with different obstacles, a novel path finding method integrating line tracking and obstacle avoidance algorithms is proposed and implemented. Experimental results indicate that our robot system with our path finding algorithm can effectively solve path finding problem in complex ground environment and avoid collision with the obstacles.