The 45^#steel sample surfaces were textured with single pulse interval laser micro-machining method by a Q switched diode-pumped solid-state Nd:YAG laser. The effect of the defocus diversity, pump currents,repetition frequency and repetition times on micro-machining profile was discussed. The test shows that the dimple diameter and depth increase while pump currents are increased. The dimple diameter and depth decrease while laser repetition frequency is increased. The dimple depth increase linearly and the dimple depth decrease slowly, while laser pulse repetition times are increased. With the laser texturing of the four cylinder-bore surfaces of the Gasoline Engine, the fuel consumption is reduced by 1 . 94 % ~ 4 . 5 % and the oil consumption is reduced by 56 % , comparing with traditional plateau honing technology.