According to the requirement of network massive storage applications, this paper puts forward a P2P based objects distribution and location model, supporting the logic network dynamically composed by a large number of voluntary nodes. The model is discussed in detail as follows: global mapping relation, routing table, object locating and routing algorithm, object indices distribution scheme, and maintenance algorithm when nodes join and leave the network. In particular, a novel scheme for distributing objects indices is provided to improve the average success rate of objects access, and each part of the model is improved. Through analysis, the model fulfills the five objectives given in the introduction. Finally, a simulation program built on this model verifies the expected abilities for balancing the load distribution and improving the objects access efficiency.