Pepper strong seedlings should be thick and short stems, compact internodes, leaf hypertrophy, dark green color, roots should be more, root color white, after transplanting new leaves spread faster. However, the peppers cultivated in plastic greenhouses are often grown abnormally when they are transplanted. The leaves are large and thin, the stems are thin and slender, the leaves are pale, and the petioles are long; or the leaves are small and thick, and the colors are dark and dark. The stems are fine and hard, the internodes are short, the new roots are short and short, yellow and brown; or the leaves are rolled upwards, and the new leaves are drooping and falling off. Caused the abnormal development of pepper seedlings, first, the partial nitrogen fertilizer on the seedbed, the large seeding rate, the late seedlings; Second, the base fertilizer deficiency, drought water loss; Third, the cold caused by freezing; Fourth, even the long time of rain, no timely ventilation Fifth, after a long drought, watering is too much, and its physiological disorders. The normal growth of cotyledons is a sign of strong pepper seedlings, and strong seedlings are the basis for high yield of peppers. For pepper seedlings to grow robustly, conditions must be created to prevent abnormal seedlings from occurring. First, we must adhere to the nutrition seedlings, organic fertilizer should account for 70% of the nutrient soil, at the same time should be appropriate application of superphosphate, per 1000 kg nutrient soil to join the superphosphate 1--2 kg; 2 to water see dry see wet, large Dry and wet, small dry, wet, sunny, more pouring, less cloudy or not pouring, warming and more pouring, cooling and less pouring. During the transplanting process, the root water is poured and the seedlings are sowed. The seedlings are poured and then watered once; the third is to control the temperature scientifically; the temperature of the shed is not lower than 15° C. and higher than 35° C.; and the fourth is to take time out to consolidate the seedlings and encounter continuous rain. Noon should be quickly exhausted, the use of scattered light; five and time seedlings, spray 1:800 times Huimanfeng active liquid fertilizer and other raising. China Agricultural Network Editor