The incidence rate of colorectal cancer is increasing year by year.Even after radical surgery,30%-50%of patients still have recurrence.Once recurrence occurs,the survival condition of patients declines linearly.Early postoperative prediction of recurrence and timely intervention and treatment measures can significantly improve the prognosis and quality of life of patients.This article discusses the advantages and disadvantages of different detection methods for predicting early postoperative recurrence of colorectal cancer,in order to provide assistance for clinical physicians in diagnosing and treating patients with postoperative recurrence.