中国版图辽阔,地多起伏,其气候之复杂,可以想见,汇其大同,略其小异,釐订为若干气候区域,化繁为简,自属必要之举,惟气候因子匪止一端,平均数值,匪止一种,孰取孰从,大费周章,各家以依据之不同,遂致见仁见智,互有参差,而学者时感无所适从之苦,是以论气候区域,应先立若干原则,以资遵循,庶可免歧途之失

The classification of the world climates proposed by W. Koeppen is undoubtedly simple, definite arid systematic. But as it is intended for the world at large, the cliriiatic types so deduced are inevitably too sket-chy and possess too much differences therein. One may glance over the appending chart 1, newly preparLd by the author and find out immediately tbat the Koeppen's climatic types, especially BS, Cwa, Cfa and Dw, cove-ring too vast an area, can hardly b0 recognized as climatic urLities. Either rain.fali or temperature varies greatly within these areas. Consequently， the land utilization in their various parts is far from unifoxm. It is th-erefore of neccesity to make some rivision when we apply the Koeppen's schema for classifying the Chinese climates.