With three GCM's-produced change in annual mean temperature and rainfall on account of CO₂ concentration doubling in the atmosphere as the climatic background,analysis is performed of the expected change of the geographic limits of Chinese firs growing in China and of ecological climate adaptiveness of the commercial timber plantations.It is estimated that the northward shifts of both the southern and northern limits will occur to varying degree,with the area tobe reduced.Further,only a small part of the firgrowing bases now available will keep excellent conditions of the ecological climate.