Abstract: Since 2007,CPI in our country has reached new high repeatedly. Using data published by State Statistical Burcau, and processing them, we applied BP neural network with momentum item to forecast separately CPI in 2008 and in 2009 will be respectively 104. 91 and 104. 88,CPI in the first quarter and second quarter of 2008 is respectively 106. 36 and 106. 53,CPI for food classification will be respectively 116. 52 and 116. 32,and also put forward some corresponding policy proposals.

Key words: CPI, CPI for food classification,BP neural network, Prediction, Countermeasure