Prior to that, Si served as the chief of the Organization Department of the Zhejiang provincial Chinese Communist Party Committee.
He worked for several years under Xi Jinping, who was serving as the CCP Committee Secretary of Zhejiang.
He rose through the ranks and successively served as the CCP Committee Secretary of Pujiang County, the head of the Organization Department for the party organization in the city of Huzhou and later CCP Deputy Committee Secretary.
[citation needed] In 2010, Si, having reached the mandatory retirement age of 60, was transferred from his Organization Department leadership position to take on the largely ceremonial role of Vice Chairman of the Zhejiang Provincial People's Political Consultative Conference.
He was accused of violating the Eight-point Regulation, "playing golf rounds paid for by others", aiding the promotion and business activities of associates and taking "massive bribes", and "committed adultery."