The third tour branchline civil airport in Nyingchi Prefecture had b u ilt in March 2006 in Tibet. The flight adjustment and experiment were delayed du e to the complex geographical environment and severe weather condition. In the c omplicated climate background over QinghaiTibet Plateau and based on the meteo r ological data which was achieved before airport construction and during the flig ht adjustment, the flight weather influencing factors has been studied and the w eather adjustment condition in Nyingchi airport has been discussed. The results have great reference value for aviation meteorological information service over plateau region.