Two novel gelators Azo-1 and Azo-2 based on azobenzene were designed and synthesized. The two gelators can form gel in the multiple organic solvents. The SEM images of the xerogels showed the diameter of the gel fibers increased with the increase of polar organic solvents. Further investigation on gelation behavior based on Hansen solubility parameters of solvents revealed that most of solvents could form gels cluster in a certain region in Hansen space， and the value Tgel of gel was influenced by the dispersion parameters. The spectra character of the gelator in gel phase and sol phase was examined by UV-Vis spectra. The azobenzene group of Azo-1 in solution had a much faster trans-cis photoisomerization reaction than that of Azo-2. The azobenzene groups of Azo-1 in the gel in certain solvents performed the expected trans-cis photoisomerization with a gel to sol phase upon irradiation of UV light. An obvious change of morphologies occurred in gel phase and sol phase. The three solvents that could produce photo-induced phase transition lie on the same line in Hansen space.