A study was about the surface soil enzyme activity and N indicators Variation characteristics of Phyllostachys bambusoides forma shouzhu Yi forest in Liangping, Chongqing Municipality in spring and summer. The results showed that, the forest soil content of organic matter(OM), total nitrogen(TN), available nitrogen(AN) and activity of protease(PRO) performance summer higher than spring,the forest soil activity of urease(URE), catalase(CAT) performance spring higher than summer. Between and

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... OM, TN, AN performance highly significant positive correlation. Between and among PRO, OM, TN, AN performance a significant or highly significant positive correlation. Between and among URE, CAT, OM, TN, AN performance highly significant negative correlation. The research showed that, the PRO activity could represent nitrogen nutrient condition of P. Bambusoides f. shouzhu Yi forest soil, in order to improve the sprouting rate and survival quality of bamboo by improve enzyme activity through optimizing forest environment. For spring urease and catalase activity higher and the nitrogen content lower, so we should pay attention to timely replenishment of nitrogen nutrients.