The phone 3D animation automatically generating system is to achieve the goal that the user sent the information to the server. After a serial process of information extracting, plot planning and scenario planning, the system would finally generated and sent a video animation which is related to the information contents to the receiver. Here, animation scenes planning module plans the various details of the plot basing on the plot qualitative and quantified into a three-dimensional animation scene file. Basing on animated plot planning, this paper mainly studies the spatial layout of the three-dimensional scene, make a layout of the three-dimensional available scene space according to semantic information of the object, design and achieve a three-dimensional scene layout repository, and ultimately achieve a reasonable placement of three dimensional objects. Experiment results show that this system could not only ensure unobstructed placed objects but also allows the same object to be added more, which makes the objects more diversity and reflects the semantic information of an object.