上银行网站
Submit your redemption requests through the DBS/POSB, OCBC or UOB ATMs and internet banking portals, and OCBC's mobile application. Redemption requests for Savings Bonds purchased with SRS funds can only be made via the internet banking portal of your SRS operator.
http://www.sgs.gov.sg/savingsbonds/Your-SSB/How-to-redeem.aspx