BEPCII，funded by the Central Government at a cost of 640 million RMB, has entered into its second phase. On July 4, the dismantlement of the old and the installation of the new with the old single ring being replaced by a new double ring formally started, which is the most crucial and difficult “battle” for the upgrading project. Before this, the first phase - the Linac upgrade - has been finished successfully, and the development and fabrication of the storage ring and detector components are well under way.

　　The circumference of a successful double ring collider is mostly over 2 kilometers, while that of the BEPC is only 240 meters. What’s more, its crossing section and the interaction region are narrow and short, the BEPCII has been designed as such that in its 240 meters circumference, two storage rings, one for electrons and the other for positrons, will be built. The performance will be improved after the upgrade by a factor of 100 compared to the old single ring. At the same time, the BSRF insertion devices and front ends must be increased, all of which have added great difficulties to the upgrade project.

　　BEPCII Project Manager, Hesheng Chen, emphasizes that quality is the guarantee to the upgrade schedule and the basis for reaching the designed specifications. He further calls on that everybody involved should pay special attention to quality, and every detail in all links of the upgrade, thus ensuring the second phase being accomplished in an all round way.

　　It is expected that the new BEPCII storage ring will be commissioned in June, 2006.