Abstract: The paper aims to master the market situation of aquatic products, monitor aquatic industry development and guide the fishermen to produce effectively, we took the average monthly price of staple freshwater fish from June 2007 to December 2016 from Beijing market as the object for the research, and analyzed the price fluctuations rules; besides that, X12 seasonal adjustment method and HP filter method were used for the empirical analysis of price fluctuation characteristics and fluctuation cycle. The results showed that: the price was in an upward trend of cycle fluctuation, part of which were in severe fluctuation because of the accidental factors such as market and production; the price also had significantly seasonal characteristics, but was not sensitive to the holidays and festivals; the price of silver carp was lower and the bighead carp was higher than that of the other breeds in each year; the price fluctuation cycle was closely related to the production cycle, which was about 10 months. Based on the above research conclusion, it is suggested that the aquatic products should be supplied in market in a disperse way to reduce the impact of production mode on the price fluctuation, and promote the aquatic production in a smooth way.