Objective To prospectively study the accuracy of disposable graduated biopsy forceps in measuring the size of endoscopic polyps and to explore methods to improve the estimation of endoscopic polyp size; Methods Based on disposable biopsy forceps, a scale with an interval of 1 mm was engraved with medical pigment from the beginning of the biopsy forceps wire as a scale for assessing tumor size under endoscopy, and the national anorectal medical center of the Third Affiliated Hospital of Nanjing University of Traditional Chinese Medicine Colorectal polyps found by four endoscopists who had operated colonoscopy for more than 3 years and completed more than 2000 cases of colonoscopic examination and treatment were used as study subjects to compare the size estimated directly, estimated using biopsy forceps, and measured directly after polyp capsulectomy; Results From 2013.5-6 four doctors found 58 colorectal polyps in 43 colonoscopy patients, including 32 males and 11 cases, with a mean age of 59.81±19.81 (28-80) years, and the actual mean maximum diameter of polyps measured after resection was 1.02±21px (0.3-87.5px), of which 36 were <25px polyps, 15 were 1-50px polyps, and 7 were >50px polyps, with a mean value of 1.29±26.75px estimated solely under endoscopy, with The difference between the actual measurements was statistically significant (p=0.000); using endoscopic biopsy forceps estimation, the mean value was 1.02±20.5px, which was not statistically significant from the actual measurements (p=0.775); the difference between endoscopic biopsy forceps estimation and estimation alone was statistically significant (p=0.000); comparing conventional estimation and endoscopic biopsy forceps estimation with the actual measurements, the The ratio of conventional estimation to actual measurement was 1.29±0.31, while the difference between endoscopic biopsy forceps estimation and actual measurement was 1.02±0.11, which was statistically significant (p=0.000); Conclusion The accuracy of measurement is lower when “estimation” is done by experience alone under endoscopy, and the use of endoscopic graduated biopsy forceps The use of endoscopic graduated biopsy forceps as a “ruler” significantly improved the accuracy of polyp size judgment; although there may be some error in judgment for larger bulging polyps over 50px, the difference value was significantly reduced.