The development of remote sensing technology provides strong support for monitoring the dynamic changes of the ecological environment. Shandian River is the ecological barrier of Beijing,Tianjing and Hebei Province. The eco - environment of Shandian River has aroused more and more attention among people,with the global climate change and human activities. In this paper,the authors used the remote sensing images obtained from 1985 to 2015 to study the changes of eco - environment of the upstream of Shandian River. Some conclusions have been reached: in 2015,the area of forest,grassland,unused land,water and cultivated land in study area was 413. 75 km~2,276. 90 km~2,1 779. 94 km~2,17. 29 km~2,and 1 583. 71 km~2 respectively,with the percentage being 10. 16%,6. 80%,43. 72%,0. 42% and 38. 90% respectively. From 1985 to 2015,the forest area exhibited a downward trend,with the declining rate being 1. 395 km~2·a~(-1) . The grass land was declined too,with the declining rate between 9. 47 km~2·a~(-1) . The water remains unchanged in the past 30 years.