Stability calculation for armor block in regulation structures under current scour is important for the design of an inland waterway regulation project. As more and more Chinese design companies are involved in overseas projects，design engineers must master different standards and calculation methods commonly used in projects both in China and abroad. This paper introduces the Pilarczyk method commonly adopted in foreign projects，the Escarameia and May method recommended by HR Wallingford，the American standard Maynord method，and methods proposed in the Design Code for Waterway Engineering and Code for design of levee project of China. Through comparison，the paper summarizes the differences between these calculation methods and further verifies them through engineering examples. The results show that calculation based on Chinese codes is relatively easy to be implemented，but it only considers fewer influencing factors. On the contrary，the commonly used foreign methods are more comprehensive and have a wider application range，but they involve a relatively complicated process.