I am Singapore PR ~ husband. How to apply? If he has been rejected before, what is the success rate now?

Although you are a permanent resident of Singapore, it is impossible for you to apply for permanent residence for your husband. According to the regulations of the Singapore Immigration Bureau, your husband can only rely on his own background to submit an application. At the time of application, you can submit your marriage notarization and proof, as well as your permanent resident status for consideration by the Singapore Immigration Bureau. Success depends on immigration.

Although your husband's application for SP/STP was rejected, it does not mean that your husband can't apply for PR. Immigration Singapore processes applications on a case-by-case basis. Of course, the rejection of past applications will also be used as a reference background.