Whether in the new Internet business model will influence the risk of money market fund is a new problem for both investors and fund managers. In the paper, the money market fund will be divided into three types which are traditional funds, the traditional-Internet traditional fund and Internet Fund. The volatility risks on return of 24 funds will be measured through the GARCH model VaR method, and the data is over a year. Results show that the VaR of pure Internet Fund is the smallest of the three types, and that means volatility risk on return is lowest and it is quiet stable. After the comparison with actual value and model of reliability test, it is recommended that investors can regard Internet money market fund as a stable financial product with low risk.