Abstract: A sequence of paralic strata which contains biota fossils from Early-Middle Devonian is found in Bukadaban district in west-middle section of East Kunlun Mt. and it is certained there is the strata of Devonian period. The sequence of the strata may be correlated with the Devonian period Bulakebashi Formation in west section of East Kunlun. By the researching currently, the range of the Early-Middle Devonian strata ranging from west to east in west-middle section of East Kunlun Mt.is certained. Meanwhile, discovery and its tectono-paleogeography background of the strata has a great significance for the study of orogenic belt of East Kunlun Mt.