Abstract: By black early-warning model, this paper analyzed the abnormal fluctuations of key agricultural product's price information in China by using the prices fluctuation rate as the warning condition index, as well as using the 1-2 times standard deviation of the average CPI monthly fluctuation rate as the warning limit. The results showed that, in 2013, there was less abnormal price fluctuation of rice industry, but ferrous price fluctuation of pork and egg industries. Therefore, in order to keep the healthy development of agricultural products market, we should decrease the production cost and increase the macro-control ability of agricultural products market, we still need to accelerate the agricultural scientific & technology research and the agricultural means of production market regulation, etc.