〔Abstract〕 Objective To screen the risk factors of cesarean scar diverticula(CSD) after cesarean section and to construct a risk prediction model. Methods 491 cases of mothers who underwent cesarean section were recruited as the study subjects, and the data from the database of negative ultrasound of mothers who returned to the hospital 12 months after operation were collected, and the dataset was randomly divided into the training set and the test group according to 7 ∶3; the variables were screened to obtain the risk factors of CSD and the risk prediction model was constructed by the use of least absolute shrinkage and selection operator(LASSO); the variables were screened using the LASSO to obtain the characteristic variables, and the characteristic variables were analyzed by multifactorial logistic regression analysis, and the nomogram prediction model was constructed by using the R software. Results A total of 491 cases of sample data were included, including 344 cases in the training set and 147 cases in the test set; feature variables were screened by LASSO, and ten-fold cross-validation was used. Five variables were finally screened: number of cesarean deliveries, number of years between two cesarean deliveries, 24-hour hemorrhage, operation time and uterine position(P