The presence of a distinct fishy odor in the postpartum period indicates a possible infection in the uterine cavity. It may be due to the residual placenta and fetal membrane tissue in the uterine cavity after delivery and secondary infection, or it may be caused by simple infection in the uterine cavity. When this symptom appears, the mother needs to go to the obstetrics or gynecology department of a regular public hospital as soon as possible to do gynecological ultrasound examination, gynecological internal examination, secretion test, routine blood test, etc., to further analyze and clarify the specific cause according to the test results. If there are obvious residues in the uterine cavity and the area of residues is small, treatment can be considered by taking medication to promote blood circulation and discharge, while more residues need to be treated by operation to clear the uterus. Anti-infection treatment with sensitive antibacterial drugs is required before, during and after the operation.