The parameter θ of parameter space was classified as different resolutions and the θ axis of parameter space was refined to required precision by iteration method. Two different Hough transformations shall be operated: Low-resolution Globe Hough Transformation and High-resolution Regional Hough Transformation. Under different of parameter θ (△θ0) value: 2°, 3°, 4°, 5°, 7.5°, 9° and 10°, analysis results of Multi-resolution Hough Transformation (MHT) Analysis of Welding Image resolution were researched and compared with Standard Hough Transformation (SHT). It demonstrates that the results of MHT coincide with SHT, moreover, the memory requirements decrease and calculating speed increases three times when the value of △θ0 is 6°.