In this paper, which considered of institutional design for smaller entities accounting. The accounting standards shoud be separated smaller entities from large entities. We have established the guidance on accounting of small and medium-sized entities at 2005, and the basic guidelines on accounting of small and medium-sized enterprises at 2012. The guidance on accounting of the small and medium-sized entities is single standard, but the basic guideline on accounting of small and medium-sized enterprises is double standard. We will compare single standard with double standard and examined.