Following the computer technology rapid development, in particular network technology swift and violent innovation, now the society has been quietly sent in the information age. When extremely emphasizing the use of distributional enterprise calculation platform, we must protect the data that are object instances at any price and make them to exist forever even in face of the network trouble, memory leakiness, server collapse and other situations; So it has the extremely important practical significance to solve the storing conflict between the persistent objects, and to study the ORM and related mechanism.