Objective To explore the curative effect and safety of cold snare polypectomy for colorectal adenoma of less than 15 mm. Methods Data of 464 colorectal adenoma from 315 patients who were treated with cold snare polypectomy (CSP) and cold endoscopic mucosal resection (cold EMR) in the Third People""s Hospital of Jingdezhen from January 2018 to December 2019 were collected. Patients were divided into group A（3-5 mm）, B (6-9 mm), and C (10-15 mm) according to the size of adenoma. Enbloc resection rate, immediate bleeding during polypectomy,delayed postpolypectomy bleeding, cold snare defect protrusions（CSDPs）and postoperative recurrence were analyzed. Results The overall enbloc resection rate was 99.4%(461/464)，and 100.0%(248/248)，98.8%(170/172)，97.7%(43/44) respectively in group A, B, and C without significant difference（P =0.126，95%CI: 0.097-0.157）. The overall incidence of immediate bleeding during polypectomy was 1.1%(5/464), and 0.4%(1/248), 1.7%(3/172), 2.3%(1/44) respectively in group A, B, and C without significant difference(P = 0.267, 95%CI: 0.227-0.308), showing an upward trend in the immediate postpolypectomy bleeding incidence with the increase of diameter of the polyps. No delayed postpolypectomy bleeding occurred. The overall incidence of CSDPs was 20.5%(95/464), 16.4%(63/384) and 40.0%(32/80) in the group of CSP and cold EMR respectively with significant difference(P<0.001, 95%CI: 0-0.006), showing an upward trend in the incidence of CSDPs with the increase of the diameter. A total of 286 adenomas in 195 patients were followed up. The median follow-up time was 9.7 months. Three patients relapsed. Conclusion CSP is safe and effective for colorectal adenoma ≤15 mm with low incidence of immediate bleeding during polypectomy and recurrence, and no delayed postprocedural bleeding.