Abstract: In order to reduce the subjectivity in evaluating the double wire pulsed welding process stability, a quantitative evaluation method was proposedbased on the probability density distribution. Firstly, the effect of current parameters on the probability density distribution was analyzed. Secondly, three sub-indicators of K_DT (the ratio between the peak probability density), K_S (the sum of the peak probabilities) and K_P (the interval probability) were designed, and the final quantitative indicators of C_pdf and TC_pdf were extracted. Finally, an experiment was designed to test the validity of the method. The result shows that the quantitative indicators accurately reflect the degree of stability for different double wire welding signals. Quantitative evaluation of the welding process stability can be achieved. The research provides a decision-making for parameter optimization of process analysis and intelligent control.