With the improvement of technology, the errors caused by mechanical reasons in the manufacturing process of civil aircraft become fewer and fewer, while more and more errors caused by human factors have gradually evolved into important factors that hinder the improvement of product quality. In the traditional process of human factors analysis, the human factors that cause quality problems are usually judged based on experience. There is no standardized model for in-depth analysis of human factors. In actual work, there may be situations where the team leader decides by one vote. So, the result of decision-making is often a temporary solution rather than a permanent cure. Therefore, the SHEL model is used to locate the on-site problems; secondly, by studying 12 common human factors regulations of ICAO, a human factors checklist for civil aircraft manufacturing process is compiled firstly, then, the Banzhaf power index method is used to allocate the voter's right index determines the harmful human factors that cause quality problems through team decision-making methods. Finally, corresponding corrective measures are proposed for the human factor decision results. This process makes the human factors decision of the entire civil aircraft product more objective and rational.