It should be less than 15%. Different systems are different for papers with different degree levels. The duplicate checking probability of normal papers is less than 30%, the duplicate checking rate of professional papers is 30%, the duplicate checking rate of undergraduate papers is 25% and 20%, the duplicate checking rate of master papers is 10%, the duplicate checking rate of doctoral papers is 15%, and the duplicate checking rate is below 5%. Need to meet specific duplicate checking rate standards. Paper duplication checking: There are various paper similarity detection systems in the market, and some personal detection websites provide false paper detection results to students through fraud, which leads to market confusion. This situation must be controlled.