Taking Henan province as a example in this paper, the method of building freezing index is put forward according to two factors of forming WFD, degrees and days of WFD per year are calculated from database.

• 本文以河南为例,从构成晚霜冻害的两个因素出发,提出了晚霜冻害指数构建方法,并从多年数据库中计算出逐年晚霜冻害发生程度和发生天数。