i found out that there is a lot of domain auction site.

may i know which 1 is better?

i have a domain to sell. .

thank you

Sedo is good providing your domain has a value to it :)

one more vote for Sedo here! :D

None of them are much good (timewise) unless you have a valuable name. What is the domain you are selling? TDNAM has a 7 day auction format. But of course unless your domain is valuable, like the others, it's unlikely to attract any bids.