Abstract: Spraying 5 mmol·L-1 NaHSO3 and KHSO3 on the 10\|11 a Red Fuji apple trees was carried out under high temperature， strong sunlight and arid condition or low temperature， poor sunlight and rainy condition to investigate the effect of bisulfate on the photosynthetic pigments content and fruit growth of Red Fuji apple， and water was used as the control. The results showed that the experimental groups were superior to the control significantly， and the effect of KHSO3 was better than that of NaHSO3. It was also concluded that the photosynthetic pigments under the low temperature， poor sunlight and rainy condition were higher than that under high temperature， strong sunlight and arid condition in both experimental group and the control obviously， but the fruit growth changed to the contrary.

Key words: climatic condition, bisulfite, Red Fuji apple, photosynthetic pigments, fruit growth