In accordance with the sender's message, through a series of steps such as information extraction and semantic analysis, the SMS automatic 3D animation generating system can generate a 3D animation and eventually send it back to the sender. The animation light cannot only light the whole scene, but can also foil themes, atmosphere, etc. This paper mainly focuses on automatic generation of light in SMS automatic 3D animation generating system, including qualitative planning and quantitative calculation. The qualitative planning describes themes and templates which are about light by ontology. The rule base is used to combine the subject, templates, scene, and illumination properties by rules. The quantitative calculation is combined with the specific scene, the qualitative planning information into specific data, and then calls the Maya API, and the results of qualitative planning in the Maya scene.