In the context of global climate change, nitrogen (N) deposition and precipitation variation significantly affect grassland community structure and function. Grassland management has become the research focus in the field of ecology in the past decades. However, little research so far has explored the response of grassland community with different management practices to N deposition and precipitation variation. This study was conducted in the typical grassland of Yunwu Mountain National Grassland Nature Reserve, and systematically analyzed the effects of short-term N addition and water addition on aboveground biomass, functional group composition and community diversity in the fenced grassland, cut grassland and burned grassland, in order to simulate the response of grassland community with different management practices to N deposition and precipitation variation. Results showed that effects of N addition and water addition on aboveground biomass, functional group composition and community diversity indices varied with different management practices. 1) In the fenced grasslands, N addition significantly decreased species diversity indices and had no effect on aboveround biomass. Water addition significantly increased species diversity indices. The interaction of N addition and water addition significantly increased aboveground biomass and the proportions of gramineae and cyperaceae. Species diversity indices were not significantly correlated with aboveground biomass, but species diversity indices had significant correlations with the proportion of different functional groups. The proportion of gramineae and weeds contributed the most to Shannon-Weiner diversity index. 2) In the cut gasslands, N addition and water addition (especially for the interaction of N addition and water addition) significantly increased aboveground biomass. N addition and water addition significantly decreased the proportion of gramineae, but significantly increased the proportion of weeds. N addition and water addition significantly increased species richness index, but had little effect on species evenness. The proportion of weeds and aboveground biomass contributed significantly to Shannon-Weiner diversity index. 3) In the burned grasslands, N addition and water addition significantly increased the community above-ground biomass. The effects of N and water addition on functional group composition and community diversity indices varied with different years. The interaction of N addition and water addition had culnulative effect. Shannon-Weiner diversity index was negatively correlated with aboveground biomass, and positively correlated with the proportion of cyperaceae. In all, management practices significantly affected the response of community structure and functions to N addition and water addition. Management practices also altered the relationship between grassland community primary productivity and species diversity. Community functional group contributed significantly to species diversity. This research might provide data support for the grassland management in response to global climate change.