Based on the price data of six categories of home appliances operated by JD, Suning, Gome, and Tmall, this paper analyzes the effect of digital preference and mantissa pricing on the asymmetry of price stickiness in China's online market. The study finds that there is indeed a significant number preference phenomenon in China's online market, specifically the numbers “0”, “8” and “9”, of which the number “9” is the most popular mantissa pricing. Based on the Logit model, it is further discovered that the numbers “0”, “8” and “9” have an asymmetric effect on product price changes. With the more “0”, “8” and “9” end numbers, its ability to hinder price changes becomes stronger, hence the more obvious the asymmetric effect. As product prices increase, the preference end numbers will significantly reduce the possibility of price changes. Holiday effects will significantly weaken the negative hindrance to price changes brought by the preferred mantissa, and holiday effect has even become an important factor in accelerating price increases.