Abstract: Ecological base flow is responsible for maintaining the stability of river form and ensuring the basic health of ecological environ‐ment in river.It is very important to determine the ecological base flow of rivers to protect the ecological environment of river basin and pro‐mote regional economic and social development.Based on the monthly runoff data of Langan Hydrological Station,the ecological base dis‐charge of Keriya River in arid area is calculated by using the Texas method,the guarantee rate method（Q_Pmethod）,the typical hydrological frequency year method,the northern great plains resource program method（NGPRP method）,the driest monthly average flow in the past 10years,the frequency curve method and the annual distribution method respectively.And starting from the basic functions of the ecological base flow,from the stable channel of basic form,basic survival safeguard river aquatic organisms,reflect the characteristics of the runoff during the year and change in three aspects,such as drawing water standards,and evaluation of different methods from the aspects of water ecological base flow calculation results of standard situation,comprehensive analysis and evaluation of the applicability of different calcula‐tion method.At the same time,combined with the runoff characteristics of Keriya River,the traditional ecological base flow calculation meth‐od,Texas Method is improved.The annual corresponding water amount of ecological base flow calculated by the improved Texas method is189 million m~3,accounting for 24.83%of the total annual runoff of Keriya River,and the corresponding water amount of ecological base flow in the flood season is 102 millionm~3,accounting for 20.1%of the runoff of the same section.The corresponding amount of ecological base flow in non-flood season was 87 millionm~3,accounting for about 34.4%of the runoff in the same period.Studies suggest that the ecological base flow calculated by the improved Texas method can not only meet the demand of different standard water quantity in different periods of the year,but also give more reasonable consideration to the runoff characteristics of rivers with great difference in annual distribution and the actual situation of total water resource scarcity in the basin.In the protection of river play its basic functions,maintain stable form,under the premise of avoiding serious damage to the ecological environment,water is used as much as possible for the local people’s production and living water,growing a better balance in the region ecological environment water use and the contradiction between production and living water,has a certain practical significance.