The karst peak clusters are main type of Karst landscape interspersed along Li River in Guilin. Their situation of
ecological environment has impact on the environmental change of Guilin city directly and indirectly. To study the
temporal and spatial characteristics of the impacts, two determinate region information, NDVI and TC2 were extracted
from Landsat TM data at the eight areas of Karst peak cluster. The results showed that the values of NDVI and TC<sub>2</sub> of
the some karst peak cluster have changing trend from high to low then higher for different time, that is, from 1986, 1991
to 2006, and the values of NDVI TC2 of the different Karst peak cluster are different for same period time. It has relation
in value from high to low, that is, No.5>No.4>No.3>No.8>No.7>No.6>No.2>No. As a result, ecological environment
of Guilin city has underground unsymmetrical change in time and space during past 20 years namely from 1986 to 2006.
The studying achievement can be foundation in science and technology for synthetically govern to ecological
environment of Guilin city in 21 century.