This experiment was conducted to determine the optimum temperature for seed germination of green manure. In room temperature,12 kinds of leguminous green manure seeds were treated by hot water with the initial temperature of 60,65,70,75,80,85,90 ℃，respectively. And the water under room temperature was designed as control(CK). The results showed that seed germination energy and rates of Stylosanthes guianensis was the highest in room temperature. But the other 11 kinds of green manure seed germination enegy and germination rates were significantly improved as the temperatures of hot water rose. The optimum germination temperatures to treat different green manure were as follows:85 ℃ for Calopogonium mucunoides and Chamaecrista rotundifolia,80 ℃ for Flemingia macrophylia,75 ℃ for Mucuna pruriens,70 ℃ for Pueraria phaseoloides and Cassia obtusifolia,65 ℃for Indigofera endecaphylla,60 ℃ for Phaseolus spp,Indigofera spicata,Crotalaria lanceolata and Senna obtusifolia.