Abstract: In the present paper 16 patterns of disjunction found in the flora of China are discerned and preliminary interpretations are given. The causes of the formation of these patterns ara all ascribed to historical geological events. The violent climatic changes during the Quaternary glacial periods^{[7,48,54,60,89]} undoubtedly had a vast effect on the formation of the patterns Ⅰ-XⅢ of disjunetion either in west-east direction or in north-south one. Judgiag from the facts that the primitive taxa of Calathodes, Whytockia and Boehmeria blinii all occur in Southwest China and their advanced ones in Taiwan and that the distribution centre of the Anemone hupehensis complex (A. hupehensis, A. vitifolia, and A. tomentosa) is located in the Hengduan Mountains of Southwest China, and A. hnpehensis f. alba ia disjunctively distributed in Southwest China and Taiwan, I would speculate that might exist a migration route in west-east direction from Southwest China to East China (even further eastward to Japan) durigg the Tertiary, and this very route might be the migraiton route between the floras of Southwest China and East China, including Taiwan, during the Quaternary glacial periods. On the basis of the disjunction patterns of Thaliatrum aguilegifolium var. sibiricum, Ranunculus repens and other relevant taxa mentioned in the text I would suggest that there might be two migration routes in north-so-uth direction in the eastern part of China during the Quaternary glacial periods. One route might start from Siberia or Northeast China and stre-tched southward through the North China plain and the hilly regions of Central China to South China and vice versa. The other route might set out from Siberia or Northeast China too and prolonged southwestward via the eastern margin of the Loess Plateau and the Qinling Mountains to the eastern part of the Qinghai-Xizang Plateau or even further southward to northwestern Yunnan and vice versa. The pattern XIV might be formed by the effect of the Yanshan Orogeny in the late Cretaceous or of the Hima-layan Orogeny during the Tertiary.^[66] The pattern XV might come into existence due to the marine transgressions which might take place in the Malayan Peninsula and Indonesia in the late Eocene.^[26] The uplift of the Xizang plateau in the Tertiary^[80] might be the cause for the occurrence of the pattern XVI, i. e., the disintegration of the distribution areas of Symphytnm officlnale, the genus Helleborus, and the tribe Ramondieae, aad the segregation of the two sister groups, sect. Anthriscifolium and sect. Delphinium, of the subgenus Delphinium of the genus Delphinium.