The automatic generation system of mobile phone 3D animation realizes that the 3D animation of SMS messages is generated automatically with the computer-aided technique. This study designs and implements a learning system for the automatic generation system of mobile phones 3D animation. The learning system helps the original system generate more satisfying animations for the users by building a random decision forests model which uses user evaluation as classification result. At the same time, the learning system can constantly update the learning model with the operation of the automatic generation system of mobile phones 3D animation, ultimately, to accomplish the "never-ending learning" ability.