Abstract: The tensile test at room temperature, three point bending test and impact test of high strength steel and stainless steel laser-arc composite welded joint were carried out respectirely. The stability and reliability of the tensile, bending and impact properties of the two kinds of welded joints were analyzed by weibull distribuation. The results show that for tensile strength, reliability of stainless steel is better; for bending strength, reliability of high strength steel is better; for impact absorption energy, reliability of stainless steel and high strength steel is similar.