摘要：In order to increase the beam intensity of SSC that is Heavy Ion Research Facility in Lanzhou, and to meet the demand of CSR commissioning, NB1 has been designed and built since 2002. It has presently been in operation, a serious measurement and tests indicate it achieves the designed requirements. The test demonstrates SSC beam quality and intensity could be improved obviously with this rebuncher. Base on this result, the tests and optimizing in four aspects have been done again. As a result, the system's performance is more reliable and stable.