Based on the natural environmental characteristics of Gannan Tibetan Autonomous Prefecture and Construction features of the highway G213，the influence of the highway Construction on the grassland eco一environment there is analyzed in this paper. Results show that the negative influence on vegetation during Construc;tion periods is severe. The soil environment is disturbed greatly in Certain areas rainfall erosion is the main factor in soil erosion and the loss volume of soil and water is 68 866. 7 t，63 060. 5 t of which is the lncrease. Finally  some   proposal  and   suggested  In  terms  Of  the  probable  environment  problems   In  the construetion.

 According to the investigation of Uahai一Gecha National Nature Reserves，the influence of weather disaster, climate warming and creeping environmental problems on its eco-environment  is analyzed and the corresponding protection arc shown in this paper,  It shows that weather disaster can make vegetation drought climate warming and drying, average annual temperature increased 0. }  C and rainfall 1990一1999，which compared with those during the period of 1960一1979.  As a result rated，part of the grassland degraded，the damage by rats have seriously threatened，
Or endure mechanical damage. mcasrcs With the decreased 87.5 mm during the period of ，the ato cco一environment has hccn dctcrio resources reduced and the biologic diversity has been destroyed.  Creeping environmental problems, such as the construction of the highway U213，has some influ cncc on as cco一cnv}ronmcnt.