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The experimental materials were the 5 years old grafted plants of Camellia azalea and 3 camellia cultivars (‘Dr. Clifford Parks’, ‘Hakuhan Kujaku’ and ‘Niuccio’s Bella Rossa’) which were growing in the ground. Their characteristics of photosynthesis diurnal variations were tested respectively. The results showed that: Diurnal variation of Pn (net photosynthetic rates) and Tr (transpiration rates) were single-peak curve, the peak of Pn mainly occurred before noon, and the peak of Tr were different among the camellias tested; the daily average of WUE of Camellia azalea was the highest in the 4 camellias; The correlations among the Pn, Tr and the factors on physiology and ecology showed that Gs was maximal to the influence on the change of photosynthetic characteristic parameters and had a major role to the Pn. So, Gs was a limited factor to photosynthesis. PARi was a positively correlative significantly to Pn of Camellia azalea and ‘Niuccio’s Bella Rossa’. Through the research, Camellia azalea had been proved as a highly adaptable camellia species on theory.
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