The death of all blastocysts in IVF may be caused by egg cell factor, sperm factor, chromosomal abnormality of blastocysts, etc., which need to be analyzed specifically. 1. Oocyte factor: if the number of female’s oocytes is low and the quality of oocytes is poor, it may cause failure when raising blastocysts in IVF. 2. Sperm factor: If there are abnormalities in the quality of sperms, poor sperm motility and low sperm count in men, it may also cause failure in raising blastocysts by IVF. 3. Chromosomal abnormality of blastocysts: If the chromosomes of blastocysts are abnormal, they cannot divide normally when they are cultured, and they will die on their own. There may be other reasons for the failure of IVF blastocyst raising, so it is recommended to consult doctor in time when this situation occurs, and take appropriate treatment under doctor’s guidance.