I file my tax on the 1/27/2018 and got accepted on 1/29/2018. state is already done. but when i would go on irs to check, Nothing show up? how come

This is not uncommon-it can take up to 21 days before information regarding your refund status appears on the IRS Where's My Refund tool.....if it gets beyond 21 days and you're still seeing no information, at that point you can call the IRS and they will research for you.