orthern Xinjiang is the distant eastern part of distributive area of spring ephemeral flora.There are ephemeral species 205 in total,among which 94 precent only living in Xinjiang in our cotuntry. Still over 42 sp. are the represantative of 35 genus's distribution in China. Therefore ephemeral flora is a partculare group in the desert flora of China.Since then they have important worth on the florestics and phytogeography research.