The artificial photosynthetic systems which simulated the natural photosynthetic system, were built by incorporating chlorophylls into lipid bilayer vesicles such as dihexadecylphysphate (DHP), dipalmitoylphosphatidylcholine (DPPC) and dioctadecyldimethylammonium chloride (DODAC). The formation of vesicles were identified by measuring lambda(max). value change from chloroform solution to vesicles solutions indirectly, and observed directly with SEM and TEM images. The efficiency of photosynthesis in model system was determined by measuring the amount of chlorophyll radical yields which were obtained from integration of ESR spectra. This can be used as a nano molecular devices for the light energy conversion into chemical energy.