Saline paddy field has the effect on atmospheric carbon sink during the growth period, so the carbon cycle mechanism of the saline paddy soil during the growing season plays an important role in the global carbon emission reduction and global climate change. We select Saline-alkali paddy field in west Jilin as an investigation object to study rice soil invertase activity and soil organic carbon distribution in 0~50 cm soil in different growth stages, and explore the invertase activity and soil organic carbon relationship. We take samples at 0~10, 10~20, 20~30, 30~40, 40~50 cm in not planting rice, seedling, tillering stage, tassel formation and fructicative stages respectively, and determinate the organic carbon content using a total organic carbon analyzer, 3,5-dinitrosalicylic acid colorimetry for the soil invertase activity immediately in the laboratory. The results showed that:the most soil invertase activity is at surface of soil, and invertase activity reduced significantly with increasing soil depth profile in different periods of soil; Soil organic carbon content is significantly reduced with increasing soil depth profile in all periods of soil apart from the heading stage of rice and the fructicative period, the SOC at 10~20 cm is 1.57 g·kg-1and 1.51 g·kg-1 respectively, more than 1.30 g·kg-1and 1.31 g·kg-1 of 0~10 cm soil layer. Correlation analysis showed that soil invertase activity and soil organic carbon is significantly positively correlated, and the highest correlation coefficient is 0.97 in the seedling stage of rice. Soil invertase activity profile differentiation is closely related to soil organic carbon content, and it has a significant impact on soil organic carbon pool in Western Jilin saline paddy area.%盐碱水田生长期对大气具有碳汇作用，研究其碳循环机制对全球碳减排和全球气候变化有着重要作用和意义。为进一步探究盐碱水田生态系统碳循环过程中土壤酶对有机碳的影响，选取吉林西部盐碱水田区为对象，细化生长期的不同阶段，分别于未种植水稻时、水稻幼苗期、分蘖期、抽穗期、结实期前往吉林西部典型灌区前郭县进行0~10、10~20、20~30、30~40、40~50 cm分层采样，并马上回实验室用总有机碳分析仪测定有机碳含量，用3,5—二硝基水杨酸比色法测定土壤蔗糖酶活性，研究水稻不同生长时期土壤蔗糖酶活性及土壤有机碳在0~50 cm土层的分布特征，探讨蔗糖酶活性与土壤有机碳的关系。结果表明：表层土壤蔗糖酶活性最高，在不同生长期其活性均随着土壤剖面深度的增加显著降低，并且酶活性主要集中在0~20 cm的土层中；抽穗期和结实期0~10 cm土层土壤有机碳含量分别为1.30和1.31 g·kg-1，低于10~20 cm土层1.57和1.51 g·kg-1，其余时期土壤有机碳含量随着土壤剖面深度的增加显著降低。经相关分析表明，土壤蔗糖酶活性与土壤有机碳间呈显著正相关关系，其中幼苗期蔗糖酶活性与有机碳含量的相关系数最高为0.97。吉林西部盐碱水田土壤蔗糖酶活性的剖面分异与土壤有机碳含量密切相关，土壤蔗糖酶活性对土壤有机碳库有显著的影响。
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