The ultraviolet-visible (UV-Vis) absorption spectra of chlorophyll,tea polyphenols,indigo,saffron,crocin and their co-sensitized dyes are compared.The state levels of dyes are measured by the electrochemical method. The results show that the optimum extraction conditions of chlorophyll the so lid-liquid ratio of 1∶50,extraction temperature of 60℃ and extraction time of 3.5h.The co-sensitized dyes can broaden the range of spe ctral absorption.Furthermore,the excited state level of co-sensitized dyes matches the couduction band edge of TiO₂.The photoele ctrochemical property of the co-sensitization of chlorophyll and crocin is the best.The dye-sensitized solar cells (DSSCs) were fab ricated by using natural dyes as sensitizers.Using the co-sensitization of chlorophyll and crocin dyes as sensitizer can improve t he photoelectric conversion efficiency to 0.67%,which is 2.91times larger than that of the chlorophyll.