Based on land use and land cover data

the landscape has been classified into twelve types

transition of landscape components and the changes of landscape patterns have been studied in Lancang river basin from 1985 to 2000 using GIS and Fragstats3.3.According to the results

the transition of the landscape was mainly happened among dry land

forest land

brush land

sparse woods

high-coverage grassland

middle-coverage grassland.At the landscape level

the fragmentation of landscape was decreased with a decrease in patch number from 44 054 to 44 978

the index of area-weighted fractal dimension and landscape shape index was decreased respectively

which leaded to the shape of patches more regular and simple.The other index of landscape was increased respectively

which leaded to the spatial aggregation and connectedness was improved

both the diversity and evenness of landscape were increasing.At patch level

the landscape components had a complex structural change and their pattern had a biggish difference due to man's advantaged and disadvantaged disturbance to landscape

the change trend of landscape pattern for forest land

bush forest and high-coverage grassland was consistent with that of regional landscape

however

the change trend of landscape pattern for sparse woods

middle-coverage grassland

paddy field and construction land was inconsistent with that of regional landscape

the dry land had a more complex structural change.The distribution of landscape components types has evident verticality and the landscape types about 80% distribute in elevation from 1 000 to 25 000 meter.The elevation 2500 meter is the important boundary for human activities and landscape types in this basin.The disturbance coming from human activities are focused on middle and low elevation.