Abstract: The formation principle of laser cladding source and effect of tilting mirror parameter on the distribution of source energy are analyzed in theory,and the results show that:when the other conditions keep constant,the length of laser cladding source decreases with the add of number of laser prismatic face(m);and the higher rotation rate of tilting mirror(n) is,the more unitorm distribution source will be gotten.The different specimens which had been gotten under different rotation rates were analyzed and measured about the microscopic structures,the sizes of laser cladding and the hardness of cladding layer,and the results show that:the microscopic structure varied with the change of rotation rate of tilting mirror in different area of cladding lager; the width and thickness are increased by the increase of rotation rate of tilting mirror; the hardness of cladding layer is decreased slightly by the increase of rotation rate of tilting mirror.