By using Census x12 Seasonal Adjustment Method and Hodrick-Prescott Filter Method, Frequency (band-pass) Filter Method, it was found that there are obvious and regular seasonal feature in the fluctuation of pork price in China; Unexpected event or contingency shocks affect pork price significantly; Over the long-term view, pork price displays a rising trend; Pork price fluctuation approximately experienced 3 complete cycles from Jan, 1996 to May, 2009. The length of the cycles is between 37 and 49 months, and the average length is 42.33 months.
