Based on the ground meteorological elements data, interim daily reanalysis data and DEM data, this paper discussed the structure of Kunming Quasi-Stationary Front (KQSF) when it moved westward, gone eastward and kept sustaining. The movements of KQSF are closely related to the weather of Yunnan, Guizhou and south Sichuan in winter, so it is important to study its frontal structure and shift mechanism. By using synthetic analysis and disusing the circulation features, meteorological factors and frontogenesis function terms, we can draw some mainly conclusions:When the isotherm between lower atmosphere and ground presents "V" distribution, and the frontal secondary circulation is relatively deep, the front is easy to move westward; when the lower atmosphere presents deep inversion layer, and the frontal secondary circulation is very thin, the front is tend to move eastward; when the inversion layer only exists in lower atmosphere, and there is a cold center in surface layer, the front tends to sustain. For the vertical structure of the u wind, when the border of east and west wind is on the left side of the front, the front tends to move westward, on the contrary it tends to go eastward; when the border is basically coincident with front, it's likely to sustain. When there exists continuous transmission of east wind behind of the front, undulating topography can change the vertical distribution of wind near ground, which leads to the multiple centers of rising and sinking. For the vertical motion tilting term, there is a strong phenomenon of frontolysis in the windward slope near 105°E when the font goes westward, and there is a weak phenomenon of frontogenesis when the font goes eastward or keeps still. For the horizontal divergence term, it is related to the gradient of equivalent potential temperature and horizontal divergence, and it contributes much to frontogenesis. Horizontal divergence term is predictable to front's movement, when the strong frontogenetical area is on the left side of front, the front tends to go westward; when the strong frontogenetical area is on the right side of the front, and the phenomenon of frontogenesis is weak, the front tends to go eastward; when the strong frontogenesis is basically coincident with frontal zone, the front tends to sustain. For the horizontal deformation term, it consists of tilting term and deformation term, and tilting term is more important to frontogenesis. For the expansion deformation term, there is a stronger phenomenon of frontolysis in the east of 104°E because of the interaction between cold air mass and windward slope.
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