Abstract: Parakn1eria yunnanensis Hu,aplant under second-1evel protection in ourcountry, has a narrow distribution range and is scare in present group。Its naturalecological environment,life cycle and natural regeneration have been studied since1980.Seeds have been collected,saplings have been transplanted in three differentecological environments（Kunming, Xichou County,Wenshan County）and have beengrowing.Their growth and development characteristics,adaptive capacity for the diffe-rent environments and resistance to pest under artificial cutural condition have beenstudied.The chemical composition of aromatic oil in its flowers and leaves have been de-tected.The suggestion about its utilizable way and developing division are put forward inthis paper.