Nowadays, the demand of people on the phones is very large. In order to help consumers have the better reference resources when they buy mobile phones, cell phones price forecasting on adaptive sliding windows is discussed in this paper. One year price for ten type's mobile phone which extracted from www.360buy.com is used as the original data to forecast the price based on the adaptive sliding windows. According to this forecasting method, the experiments are implemented under the different sliding window width for different type's cell phones depend on the accuracy rata. Comparing the experimental results with the original data, the forecast results are very satisfactory. And the forecasting average accuracy obtains 99.4 percent. Experiment results prove that the research is meaningful and useful and it is not only for consumers, but also for businesses in the cell phones market.