Mold is ubiquitous in the natural environment and diffuses with air,water and other media in the form of spores.It can pollute the raw materials of food and the production environment,and is the main reason for the deterioration of fermented milk.As fermented milk products with short shelf life and need cold-chain storage and sale, sporadic mould contamination will not cause food safety problems,but it will be lost because of some sales terminals and cold-chain transportation in the third and fourth line markets,the growth of mold was obvious mildew spots, which affected the quality of food to some extent.Lead to poor consumer experience,to the enterprise brand caused a very bad impact.This paper summarizes the analysis,verification and control measures of sporadic contamination of mold in fermented milk,in order to better analyze the source of mold in fermented milk and provide reference for controlling mold in fermented milk.