The characteristics of Jinta Oasis on 5 July, 2004 was successfully simulated using the mesoscale model MM5 on the basis of replacing the landuse in the domain 3. The simulated results showed that in the day time, the oasis was a cold source, it maintains till 3000 m above the ground and the temperature-difference between the oasis and desert was the highest near the ground and the intensity of cold center weakened from low level to high level; the departure of the pressure field was positive on lower levels and negative on higher levels on the oasis, and the transition of them happened near 1300 m heights, and vice versa in desert; on lower levels the wind blew from the oasis, and the divergence weakened with the height. Above 750 hPa, the background wind dominated and there were some convergent; the anomaly wind field are divergent on lower levels and convergent on higher levels. The wind velocity was the smallest near the divergent/convergent center on the oasis and increased far from it. There was updraft on deserts and downdraft dominated the whole oasis. There were more than one downdraft center, and the height of it was not the same, which was the lowest on the center of oasis and higher on both sides of oasis. The strongest downdraft appeared on the edge of the oasis; Divergence distributed uniformly over lower levels of oasis and scattered convergence distributed on desert, 750 hPa convergence region began to appear over the oasis. On 700 hPa it dominated over the oasis, and convergence was the strongest on the edge of the oasis and desert. While over desert, there were almost the divergent and a little of convergent. Specific humidity and moist potential temperature have similar characteristics. Up a certain height and above it, their contours formed low trough and the centers of trough moved from high to low and from west to east under the influence of the downdraft and the background of west wind.