A cold air invasion process into the Qinling Mountains during January 20-22,1997 is simulated by using the regional climate model RegCM3 with a higher resolution(10km),and the Qingling Mountain's barrier and blocking effects on cold air are examined as well.The results show that the simulated temperature and pressure changes are basically in good agreement with the observations,and the Qingling Mountain's barrier and blocking effects can lead to more than 4 ℃temperature difference between the south and north sides of the mountains and retard the cold air for more than 12 hours.The analyses of the temperature and surface pressure evolutions in this cold air invasion process show that RegCM3 has good performance in simulating the features of the temperature and surface pressure changes over the complex terrain areas.