Dye-sensitized solar cells (DSSC) were fabricated using natural dyes extracted from rosella, blue pea and mixture of the dyes. Light absorption spectrum of mixed dye solution contained peaks corresponding to the contributions from both rosella and blue pea dyes. However, mixed dye adsorbed on TiO2 does not show synergistic light absorption and photo-sensitization compared to the individual dyes. Instead, the cell sensitized by single rosella dye showed the best sensitization which was in agreement with the broadest spectrum of rosella dye adsorbed on TiO2 film. The energy conversion efficiency (_) of the cell consisting of single rosella dye, single blue pea dye and mixed dye were 0.37%, 0.05% and 0.15%, respectively. The sensitization performance related to interaction between the dye and titanium dioxide surface are discussed. The explanations are supported by light absorption of dye solution compared to dye adsorbed on TiO2 and also dye structures. In order to improve TiO2 properties for DSSC, anatase TiO2 nanorods-nanotubes were produced by hydrothermal treatment of TiO2 P25 powder. The nanorods-nanotubes had diameter of 15-40 nm and length of several hundred nanometers. The specific surface area of the TiO2 was 145 m2g-1 compared to 55 m2g-1 of TiO2 P25. The dyesensitized solar cells with TiO2 nanorods-nanotubes and rosella sensitizer showed 21% the energy conversion efficiency higher than that made of TiO2 P25 ( 0.45% compared to 0.37 %). A further improvement of the efficiency of dye-sensitized solar cell up to 0.58% was accomplished by treatment of TiO2 film in titanium isopropoxide solution.