An experiment was conducted to determine the optimum hot water treating approach of green manure seed germination.10 kinds of leguminous green manure seeds were dealt with different hot water treating approach to study their germination time，energy，rate and index.The results showed that seed germination energy and rate of Calopogonium mucunoides,Pueraria phaseoloides,Mucuna pruriens declined as the hot water treating time getting shortened，but Phaseolus spp rose，Indigofera endecaphylla and Senna obtusifolia fell after rising,Chamaecrista rotundifolia，Indigofera spicata，Crotalaria lanceolata and Cassia obtusifolia rose after falling.Green manure seeds started germination after 2~4 days，and different hot water treating approach had little influence on seed start germination.Seed germination duration of Calopogonium mucunoides，Chamaecrista rotundifolia，Senna obtusifolia and Cassia obtusifolia rose as the hot water treating time being shortened，but Pueraria phaseoloides，Phaseolus spp and Crotalaria lanceolata declined，Indigofera endecaphylla，Indigofera spicata and Mucuna pruriens were little affected.Germination of Indigofera endecaphylla,Indigofera spicata and Mucuna pruriens were not neat with long duration time，and transplanting after seedling could be an optional method to solve this problem.Treatment by heating water with natural cooling was optimum for Calopogonium mucunoides, Pueraria phaseoloides, Mucuna pruriens，Chamaecrista rotundifolia and Cassia obtusifolia.The optimum effect was observed for Phaseolus spp，Indigofera spicata and Crotalaria lanceolata when they were treated by temporary hot water then added cold water，while temporary hot water treatment then removed immediately was optimum for Indigofera endecaphylla and Senna obtusifolia.