We developed a concrete floor finishing robot (the SURF ROBO) in order to eliminate heavy-duty work and increase the efficiency of concrete floor finishing work. For about one year after development, several SURF ROBOs have been used at the practical construction sites and satisfactory results were obtained in respect of quality and efficiency. Two (2) sets of four (4) piece trowels are provided, the trowels rotate reversely against each other around the caterpillars and the trowels make the concrete floor smooth as well fine as by the skilled worker. After practicing with this robot, we found that it has the capacity for finishing of a concrete-floor surface of 300m2 per hour and it provided the same effect of a concrete-floor direct finish with precision as a plasterer. But, as working time cannot be reduced by the SURF ROBO because of bleeding water, we have been developing the dehydration robot.