dear sir i want visit never again to china. How apply to vissa

You just confused me. Do you mean you've never been to China or you plan to visit China again? Anyway, you may just apply for the visa from the China Embassy in Sri Lanka. One thing to mention, if you go to China for tourism, you have to take part in a China tour group of 5 members or more, since China Embassy doesn't accept individual applicant who apply for China tourist visa.