In recent years, due to the increasingly complex economic environment at home and abroad，the live pig price fluctuation is also becoming more difficult to control. Selecting the monthly price of live pig from 2000 to 2011, The paper is firstly dividing into three fluctuation circles by using the HP method, then analyses live pig price influencing factors from the live pig production costs, mode of production and the producer’s expectation, finally The suggestions for stabilizing the live pig price are given unifies the Shandong province live pig price fluctuation and influence factors.