Abstract: Under different low temperature and poor light treatment， the photosynthetic characteristics of four different origin pepper were studied. The results showed that with falling temperature and light intensity， photosynthetic parameters and chlorophyll fluorescence parameters of four different origin pepper substantially decreased. These results indicated that low temperature and poor light affected the photosynthesis of pepper seedlings by directly reducing the activity of the photosynthetic tissue and destroying PSⅡ reaction center. Besides， material 20805 originated in Turkey showed better low light utilization ability and stronger photochemical efficiency， material 07\|1\|1\|0\|1\|2 originated in the Yangtze River Delta region of China was the worst. It could be speculated that under low temperature and poor light， differences in photosynthetic characteristics of pepper seedlings might be due to the difference in the climate of pepper origin.

Key words: pepper, low temperature and poor light, photosynthetic parameter, chlorophyll fluorescence parameter