Abstract
This paper shows the results of studies the main reasons for the negative transformation of various ecosystems of the Ili-Delta in the period of1979-2014. The studies were conducted on the basis of data analysis ondynamics of the river hydrological regime, weather conditions, economiccharacteristics, economic and other activities of the local communities,as well as field studies on land cover, vertebrate fauna of the region andthe study of multi-satellite images. Analysis of long-term (from 1970 to2013) climatic data from Bakanas and Kuigan meteorological stations, thatlocated in the survey area showed a clearly pronounced trend of the regional increase in average annual surface air temperature. So for the abovementioned period, an increase for 1,4 0 С and a decreasing trend of average annual precipitation over the same period on 10 mm, which is an additional factor contributing to the processes of drying and desertification ofhydromorphic ecosystems of the Ili-Delta.Key words: Anthropogenic pressure, climate warming, ecosystemtransformation, GIS, hydrology, Ili-Delta, Ili-Balkhash basin, water content, weather conditions.