The invention discloses a system for a robot to achieve motive sensing. The system comprises a sound source acquisition unit, a statement processing unit, an information searching unit, a voice output unit, a projecting unit, a communicating unit and a behavior control unit. The system can be used by a user for having a conversation with others at home and can also be used by the user for browsing a website, listening to music and watching videos through the robot, man-machine interaction is effectively achieved through the robot, the robot proactively detects demands of the user and flexibly screens and selects relative information with the highest key information point matching degree, and projection is achieved conveniently through the projection function of the robot.