Usually the peak period of ascites occurring in fresh blastocyst transplantation is 1~3 days after the transplantation, but because of individual differences, there may still be ascites 34 days after the transplantation, but infections and other conditions cannot be ruled out. As the process of IVF requires the stimulation of follicular development with drugs of sex hormones, it may cause increased vascular permeability and the appearance of ascites. Therefore, the peak time for the appearance of ascites is 3~7 days after the use of ovulation stimulating drugs, that is, 1~3 days after the transfer of fresh embryo sacs, and ascites of different degrees will appear. Since the duration of ascites varies from person to person, ascites may still exist 34 days after the transfer; if it is accompanied by fever, abdominal pain and other symptoms, the possibility of secondary infection should also be considered. If a woman still has ascites 34 days after fresh blastocyst transfer, accompanied by abdominal pain and other symptoms, it is recommended to consult a doctor in time, under the guidance of the doctor, complete the relevant examinations, clarify the cause of the disease and treat the symptoms.