I married a Chinese nationl in S'pore.Our married cert. is in english.Now we stay in Shenyang.In

I think so, but you should confirm this with the China Embassy in Singapore again. They have the final say to this.

Do I need to bring my marriage cert.personnaly to China Embassy to certify into chinese version ?

If you want to legalize your marriage certificate in China, it as well as the Chinese translation, should be authenticated directly by Singapore Ministry of Foreign Affairs first, then, take it to be authenticated by Chinese Embassy in Singapore. You'd better handle this personally as it is required in most countries.