By Using the data from the long term ecological observational station in forest region of Diaoluo Mountains, Hainan island,and by testing physical properties of soil sampled periodically,the effects of different secondary forest felling intensity and utilization ways,including quadrats of secondary forest control,selective felling 50% selective felling70%.clear felling slash, cultivating rubber,slash-and-burn and cultivating sugarcane and sweet potato,etc., on main soil physical properties,such as soil temp...