I don't know yet or i haven't known yet?
Which sentence is more correctly - i don't know yet when i go to China or i haven't known yet when i go to China?

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'I don't know yet' would be good as a reply to someone who asks you, 'When are you going to China?

Otherwise, sentence 1 should use 'I'm going' to be natural sounding, 'I don't know yet when I'm going to China'

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In general, we use "yet" in perfect tense. But in your sentence, when we say " i havent known yet", it is not completely correct. I think it should be" i dont know yet when i will go to China" it means i dont know the time

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I would say "I still don't know when I'm going to China" ;)