Red Zone : 2017 Thai League 4 Bangkok Metropolitan Region Yellow Zone : 2017 Thai League 4 Eastern Region Pink Zone: 2017 Thai League 4 Western Region Green Zone: 2017 Thai League 4 Northern Region Orange Zone: 2017 Thai League 4 North Eastern Region Blue Zone: 2017 Thai League 4 Southern Region Runner-up of 2017 Thai League 4 Northern Region and Runner-up of 2017 Thai League 4 Southern Region football teams pass to this round.

this round plays sudden death matches.

It is paired to 3 couples and plays Home-Away matches.

6 Thai football teams, Which win opportunity, pass to this round.

The best third-placed team would promoted to 2018 Thai League 3.