Abstract:Haemadipsa hainana is exposed to a soil humidity gradient in the laboratory. The result show that the soil water content of H. hainana habit is ranging from 15 1% to 16 77%.The field investigation in the rubber plantation show that its suitable habit is with soil water content from 16 54% to 17 66%.In the tropical rainforest its habit soil water content is ranging from 19 2% to 25 75%. Observation in door shows that non of H.hainana is active at temperature 8℃ to 9℃, leech begin to active...