Quality changes of lettuce packaged with plastic membrane were studied at 0±0.5℃, 4±1℃, 9±1℃, and 20±1℃ during storage.The result showed that the low temperature and the plastic packaging decreased the weight loss rate of lettuce and nutrition elementary losses effectively, inhibited lettuce etiolating, delayed the increase of the nitrite content significantly, and then prolonged the shelf life of lettuce.The best storage temperature of lettuce was 0℃ and its shelf life was prolonged to 50 days.