Objective To study the influence of baking on varnish cracks, the white marks of transparent inner film and film’ s peeling off after boiling. Methods By setting the varnish baking time as 10, 12 and 15 minutes respectively, the influence of difference baking time on varnish’ s representation and process resistance was analyzed. The changes in white marks of transparent inner film and the boiling resistance of baked cans were compared with non-baked ones. Results With the extension of overprint varnish baking time, the process resistance of surface varnish of printed laminated steel was improved. Baking was effective to remove the white marks of transparent inner film, and avoid film peeling after cooking. Conclusion It was found that extending the varnish baking time from 10 minutes to 15 minutes could effectively prevent varnish cracks after can-body drawing. Adding a 1 min baking step at 230 ℃ on can-body could remove the white marks, and improve the boiling resistance of the cans.