Hi There
There is leakage from bath sink to downstairs.how should I find the location of leaking and fix it?
Thanks

We should move you to plumbing, that's why you have not gotten an answer out of the 9 reads so far. Lets start with a flashlight, paper towels and some toilet paper. Open the cabinet under the sink and dry everything with the paper towels. Turn the flashilight on and do whatever you so to make the leak. If the leak strats tiny lay toilet paper all over the cabinet floor to see the first drop. OK, now tell us exactly where you see the water leak from.