At present,buying things on internet is prevent and Ma Yun have said that he wanted to change the Real Estate Market through this.Therefor the prediction for sales online is very of significance.In the paper,I established M (1,1)、DGM (1,1)、NDGM(1,1) model according to the data from 2007 to 2012,and find the best model through comparing the relative error of three models.Then I pre-dict the future market of sales online.%目前网购行为迅猛发展，马云甚至说要通过网购来改变房地产市场，因此对网购销售额的预测十分有研究意义。根据2007年至2012年的网购销售额数据，建立GM(1，1)、DGM(1，1)、NDGM(1，1)灰色预测模型，并通过相对误差的大小找到最优预测模型，对未来市场的网购销售额数据进行估计。
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