Results show that during the snowstorm disaster, under the large scale background with "trough in south and ridge in north", strong cold air caused by prevailing northerly wind in northern Asia wedged into low level atmosphere over Southeast China and formed a "clod cushion". At the same time, warm-wet air was also transported to Southeast China by southerly wind. The vertical shear of winds from cold to warm airflows produced strong upward motion and then, the warm-wet air over the cold air wedge was driven to rise. Finally, the structure of "warm cover" and "cold cushion", as well as corresponding vertical circulation over the converging frontal zone came into being.

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Cold storage cold chain is only a link, and the cold chain is a low-temperature condition of the logistics system, so the inevitable modernization of cold storage should be built on the basis of modern logistics.

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Through the study on the climate characteristics of high cold area of Qingzang Railway and using the construction experience in cold area for reference the technological measures of cold proof and heat insulation of tunnel s winter construction in high cold area are proposed.

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Later, the day of Ching Ming and the Cold Food close to the fire ban Cold Food grave civil day, gradually, and Cold Food and Qingming on the combined, while the Cold Food will serve both as a lucid another name, has become for the Ching Ming Festival, a custom, Tomb Sweeping Day fireworks not move, eat cold food.

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