The residual stress in uncoiling ship plate results in cutting and welding deformation， as a bottleneck when uncoiling ship plates are widely used in the shipyard. In this paper， the cutting and welding deformations of Shougang uncoiling and straightening ship plates are analyzed by experiments. The experiments have shown that through using the process control technology of lower levels of residual stress to optimize residual stress distribution in ship plate， the residual stress are evenly distributed in uncoiling ship plate produced by Shougang and the deform- ations of cutting and welding are small. Then it can meet the demand of the shipyard.