If I have overstayed in China b4 , and i want to enter China again , will i need to apply for visa?

If you are Singaporean citzien, you don't need a visa to Mainland China for 30 days visit. Is there China visa with * on your passport? As I know, if one overstay in China, the Immigration Department will issue he/she a 10 days visit with *, which means the person have overstayed in China. Once the immigration notice it, I think you will be forbiddened to enter China.