Abstract: Sixty donor cows were superovulated with FSH, 258 eggs (4.87±3.69 eggs per head) were collected with 153(2.89±2.58 eggs per head) useful embryos. The superovulation efficiency of heifers is higher than that of the delivered cows（86.2%︰71.0%）, while it was conversed for the total eggs（4.50±2.58︰5.22±4.53） and useful embryos（2.69±2.02︰3.07±3.06）. The suitable doze of FSH is 340mg per head for delivered cows, for the heifers is 300mg. And the seasons have little effect on the superovulation result.