Combined with field investigations and historical data,interpretation of high-precision remote sensing ima-ges shows the following facts about glacier lakes within the Ranwu-Peilong section in the upper Palongzangbu River.(1)There were 131 glacier lakes of various sizes totally, of which 99 were larger than 0.01km²,with the largest being 0.976km².(2)68 out of the 99 glacier lakes were morained lakes, with 53 distributing be-tween 4500 and 5000 maltitude and accounting for 68.7%.(3)The total area of the 83 comparable glacier lakes increased by only 2.56%, from 7.03km² in 1998 to 7.26km² in 2005.(4)The total area of glacier lakes varied little in the last 18 years, but some had an abnormal increase in area. These glacier lakes are alloceanic, so the lakes are unlikely to break at a large scale and only occasional outburst is possible