Based on double pulse welding process charocteristics,expert database structure and work flow are designed.Further,multiple outstanding specifications of 1.0 mm-diameter wire are obtained through a large number of experiments.By making non-linear regression analysis on these groups of standards,the relationship between avcrage welding current and other pulse parameters can be found out.Polynomial regression equation is set up for further realization of parameter estimation function of the expert database.Finally,the preliminary developed expert dutabase is tested.The result indicates that the unified adjusting and parameters estimation of the expert database leads to stable welding process and good weld appearance.