Study on the green method of N, N′-Dicyclohexyl thiourea 1 in water, from Carbon disulfide and cyclohexyl amine.By formation of the intermediate salt first, then the separated salt was degas (H2S) under low temperature in vacuum.The yield is over 99% and the advantages of the present procedure are mild reaction operation, easy operation and low cost, the purity is over 99.5%.It avoids such defects as unsafe, low yield.So it can be expected to have a good prospect for industrial application.