Abstract: The Physico- chemical properties of Yunnan Rose rugosa cv.‘Plena'were analysed and compared in different picking period,including sugar,protein,crude fibre,vitamin C,anthocyanin,general flavone and mineral elements.At the same time,the influencing regulation of illumination and accumulated temperature to physico-chemical components was investigated.The results showed: all physico- chemical properties changed with picking period,and was affected by flowering phase,illumination and accumulated temperature. On the whole,content of sugar,crude fibre,vitamin C,anthocyanin,general flavone had positive correlation with illumination time and accumulated temperature. Accumulated temperature 's effect was more remarkable than the illumination on metabolism and accumulation of anthocyanin and general flavone,and illumination and accumulated temperature had a greater effect than crude fiber on metabolism and accumulation of sugar. Among the mineral elements,content of K and Na changed significantly,which went to the peak in May,respectively were 235.0,6.4 mg /100 g;content of Ca and Zn went to maximum in July,respectively were 16.9,0.49 mg /100 g; content of Fe was at higher level in April,respectively was 2 mg /100 g.