In recent years, the price fluctuation of pineapple is very frequently, which makes puzzlement to producers and consumers. This paper discussed the features of pineapples price fluctuation and the impact of inflation on the price of pineapple in Fengtai district of Beijing during August 2011 to Setember 2015 as the study object. The trend and the cycle series are separated from the pineapple price of August 2011 to Setember 2015 with Census X12 seasonal adjust model and HP filtering decoraposition model, on this basis the trend of long waves of pineapple price fluctuation is investigated, the period of short waves is divided, and the law of pineapple price is analyzed. The results showed that the price of pineapple is a kind of peak type fluctuation which is steadily rising, but the expanding ability is going down; The wholesale price of pineapple is very unstable and changs a lot, the period of wave is short, the market stability is poor. The pineapple market is high risk and easily affected by other factors.%近年来，菠萝价格波动异常频繁，对消费者和生产者造成很大的影响。本文运用2011年8月至2015年9月北京丰台区新发地农产品批发市场菠萝批发价格数据作为研究对象，剔除通货膨胀对菠萝价格的影响，分析菠萝价格波动主要特征；运用CensusX12季节调整模型和 HP 滤波分解模型将2011年8月～2015年9月的菠萝价格分离出趋势和循环序列，据此考察菠萝价格长期波动的趋势，并对短期波动的周期进行划分，以此剖析菠萝价格波动存在的内在规律。研究发现：菠萝的批发价格属于一种高峰型的波动并具有稳步上涨的长期趋势，但扩张能力正在逐渐下降；菠萝的批发价格很不稳定，变动的幅度很大，波动周期短，市场稳定性差、风险高容易受到其他因素的影响。
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