from 11G, weblogic use ecliplselink as it's default jpa solution, anyone can tell me is native toplink is still be supported in weblogic 12c?
Yes, TopLink is still supported, certified and is considered the default provider in WLS, but what version do you mean and what API are you using?
You might want to checkout the TopLink datasheet and documentation though, as EclipseLink provides the core persistence used underneath TopLink.