Objective:To explore the differential expression of oncogenes and anti-oncogenes in early development-arrest-embryo tissue and normal early embryonic tissue. Methods:The expression of Bcl-2 and c-Myc oncogenes and P53 and P16 anti-oncogenes in chorionic tissue were analyzed by immunohistochemical method from 56 cases of normal early embryonic tissue and 68 cases of early development-arrest-embryo tissue. Results:The positive rates of Bcl-2 and c-Myc oncogenes in normal early embryonic tissue and early development-arrest-embryo tissue were 53.57%(30/56) vs. 30.36%(17/56) and 77.94%(53/68) vs. 45.59%(31/68) respectively. The positive rates of P53 and P16 anti-oncogenes in normal early embryonic tissue and early development-arrest-embryo tissue were 39.29%(22/56) vs. 73.21%(41/56) and 27.94%(19/68) vs. 47.06%(32/68) respectively. Conclusion:The balanced expression of oncogenes and anti-oncogenes plays an important role in early embryonic development.