Group-buying has become a new marketing mode to sellers and a fashionable purchasing pattern to consumers,and makes the market a win-win result to some extent.Sellers and consumers are two main groups of market and may affect each other.The characteristics of group-buying market were analyzed by using the Granger causality test method based on the two-sided markets theory.The results show that the group-buying market is a kind of two-sided market with obvious cross network externality in China.Furthermore,the influencing factors of group-buying market were inspected by using a time series model and panel data.Some conclusions have been made that the correlation between business scale and consumer scale is high,CPI and spending habits affect the scale of consumers.The advices and suggestions for the sound and orderly development of group-buying market in China were put forward.