To explore the impact of precipitation pattern change on the litter decomposition and nutrient release under global climate change scenario, an experiment including 50% reduction of throughfall and natural rainfall (control) was conducted in Pinus massoniana plantation. Using litter decomposition bag method, we determined the effect of throughfall reduction on the dynamic changes of decomposition rates and nutrient release of leaf litter, as well as the factors influencing the leaf litter decomposition. The results showed that the remaining mass ratio in the throughfall reduction and control were 38.09% and 38.06%, respectively, after two years of leaf litter decomposition. The carbon content of leaf litter showed a "leaching-enrichment-release" pattern during the decomposition, while nitrogen content of leaf litter was enriched to some extent without a significant difference between the throughfall reduction and control. The correlation analysis showed that remaining mass ratio of leaf litter was significantly negatively correlated with leaf litter N content and monthly accumulated temperature, while was significantly positively correlated with leaf litter C:N ratio. This study suggested that throughfall reduction did not change leaf litter decomposition rate and nutrient release pattern in Pinus massoniana. The degradation of leaf litter was closely related to N content, C:N and monthly accumulated temperature.