In this paper,the coating performance of compact waterborne b1 b21 k varnish is mainly introduced,the film-forming mechanism,film appearance performance,film abrasion resistance and aging performance of 1 K Varnish and 2 K varnish were compared and verified,the results show that there is a gap between the film performance of B1B2 process with 1 K varnish process and that of B1B2 process with 2 K varnish process,however,1 K varnish has certain advantages in cost.