BEPCII control system has built using EPICS tools by the development of 5 years and on-site installation of half year. It has been put into the beam commissioning of BEPCII since October of 2006. This paper introduces the overview of BEPCII control system and its performance as well as its upgrade during third run of the BEPCII beam commissioning. In particular, some problems such as control network and energy ramping will be also discussed.