Abstract: The present paper focuses on seqence stratigraphy of marine volcano-sedimentary basins in the Ashele-Chonghur region,Xinjiang.These Devonian volcano-sedimentary basins are occupied dominantly by the volcanic rocks in association with terrigenous and intrabasinal sediments.The authors suggest,on the basis of the studies of outcrop se-quence stratigraphy,that the main controlling factors and characteristics of the sedimenta-ry sequences and the criteria for the recognization of the sequence boundaries are quite dif-ferent in the study area from those elsewhere.The formation of the sedimentary sequences herein is closely bound up not only with sea-level changes but also with tectonic activity and volcanic eruptive cycles.