In this study, the cotton fabrics were dyied by two process cold pad batch with Vat dye. We use is Thiourea dioxide and use the combination of Thiourea dioxide / Sodium Hydrosulfite as the system .By changing the using amount of the concentration of dye, the rate of pad, the batch time and the disding-Uishing of different dye, we find out the after dying rariation in K/S, △E and strong the conduct this research. We get conclusion that use the combination of Thiourea dioxide / Sodium Hydrosulfite system that K/S was get better use the is Thiourea dioxide system and we get that use the is Thiourea dioxide system of △E was get better us the combination of Thiourea dioxide / Sodium Hydrosulfite system.