Required. In response to the update of the 2020 version of the Chinese Pharmacopoeia, as medical device companies are concerned about purified water, sterility testing and microbial counting, we compared the purified water, sterility testing and microbial counting in the 2015 and 2020 versions of the Chinese Pharmacopoeia. Chinese Pharmacopoeia refers to the Pharmacopoeia of the People's Republic of China and the State. "Chinese Pharmacopoeia", referred to as "Chinese Pharmacopoeia", is a book published by China Medical Science and Technology Press on June 5, 2015, and was created by the State Pharmacopoeia Committee.