The northwestern Tarim Basin, or northwest Kashgar, includes the southern Tianshan Mountains and the adjacent Taklimakan Desert, with a total area of about 100000 square kilometers. The East-West boundary of the region roughly coincides with the lines of 74 ° E and 80 ° e, and the North-South boundary roughly coincides with the lines of 42 ° N and 39 ° n. In terms of administrative subordination, the northwest of Tarim Basin belongs to Xinjiang province of the people's Republic of China. Its territory includes Shufu County, Yingjisha County, Atushi County, yuepuhu County, Bachu county and Maigaiti County in Kashgar region, and Keping County, Wushi county and Awati County in Aksu region. According to the surface morphology, the northwest of Tarim basin can be divided into three main landscape zones: Mountains - Southern Tianshan Mountains and Gongger mountains of Kunlun Mountains; Piedmont - Atush, bashsogon and Keping mountains; Plain area - Tarim depression and Taklimakan Desert within it. The main water system in the area is Kizilsu river. This study is a comprehensive compilation of geological structure data in the northwestern Tarim Basin. It is based on the materials obtained from the author's investigations in the region from 1941 to 1943 and from 1952 to 1953. In addition, the field data of H. A. beriyevsky (1942-1943) on keketong mountain, Tuoyun River Basin and Bachu highland, as well as the report data of 1:200000 scale surveying and mapping conducted by the 13th aerial geological exploration team of the Ministry of geology in Kashgar (geologists: Л. Б. Voitas, А. С. Makulin, Л. Н. Smirnov) in Shufu, Atush and uPAR regions of Kashgar region in 1952 were also used in the preparation process. The observation records of F. stolichka (1874), К. И. Pogdanovich (1889), K. Futrell (1898), Ф. Н. Cherneshev (1903), H. keder (1903), P. Graber (1908), Д. И. Mushketov (1916), e. Nolin (1931) and О. С. Vilov (1940) were also referred to in the study. The research carried out by the author in the northwest of Tarim Basin belongs to the nature of rapid reconnaissance of the route, aiming to find out the overall situation of the geological structure of this vast area without previous geological research. From 1941 to 1943, the author worked in the southern part of the 5th trust of the Ministry of nonferrous metals industry, while from 1952 to 1953, he served as a geological consultant for the "Suzhong metal company". His assistants were very helpful to the success of the research: in 1941-1943, it was Л. Ф. Jepriyakov, and in 1952, it was И. И. Gorov. The sorting of the materials collected from 1941 to 1943 was carried out at the Institute of geology of the Soviet Academy of Sciences and the all Soviet Institute of geology of the Ministry of geology of the Soviet Union in 1945 and 1946, while the indoor work in 1952 and 1953 was carried out at the Mongolian Commission and the coal geology Laboratory of the Soviet Academy of Sciences. The study of magmatic rock specimens was completed by Г. М. Galleyeva, and the identification of paleontological samples was completed by О. Г. Tumenskaya, Е. Д. Soshjina, М. И. Suliga Nesterenko, Е. А. Ivanova, Т. А. Dobrolubova, Л. П. Monahova, В. А. Vostokova, Т. Н. Alikova, О. С. Vilov and А. М. Auboute