By means of linear regression analysis technique, the single regression model and multiple regression model between dynamic resistance information in spot welding process of mild steel and quality parameters are studied systematically. 以动态电阻与接头质量参数之间关系为例,用线性回归分析技术,系统地研究了点焊加热过程中的监测信息与点焊接头质量参数之间的一元和多元回归模型关系。