The metastasis time of ductal carcinoma in situ of breast should be analyzed according to individual’s physical condition, psychological state and clinical stage, and there may be several months metastasis, several years metastasis or no metastasis. Ductal carcinoma in situ is caused by malignant hyperplasia of small ductal epithelial cells in the breast, which is confined to the ducts, basement membranes and does not invade the interstitium, and is mostly manifested as nipple discharge and the presence of small lumps during examination. The proliferation time of ductal carcinoma in situ is related to the stage, molecular typing and complications, etc. If the patient actively cooperates with the treatment and discovers it at an early stage, it may be cured, but if it is discovered at a late stage, the treatment effect is poor and the patient’s physical condition is poor and does not cooperate with the treatment, then metastasis may occur in a few months. It is recommended to maintain a good attitude in normal life, actively cooperate with the doctor’s treatment, discomfort, timely consultation, so as to avoid delaying the condition.