With the development of big data and various new retail technologies, online sales of fresh produce are becoming increasingly popular. A comparative comparison has been made of the relative properties of the online and offline sales model, followed by an analysis of the optimal inventory and profit of the two models according to the parameters change. The research results show that，with the product cost being small in the offline sales channel, the optimal order quantity is a decreasing function of the product retention rate, and vice versa. Whether the alternative is online or offline sales model, with the increase of market capacity, the competitive advantage of the party with a competitive advantage becomes stronger; while with the increase of price coefficient, the competitive advantage of the party with a competitive advantage becomes weaker.