Abstract: It is necessary to treat a large numbers of synchronization of oestrus to recipients before the cow embryo transplantation. This study investigated the effects of synchronization of oestrus from two different ways, parity (heifers, weaned cows and lactating cows), different nutrition levels. The result showed that two methods did not significantly affect the results of synchronization of oestrus (P> 0.05).There were kinds of results about parity effect to synchronization of oestrus. The trial investigated the optimal time of recipient cattle with calves is least 3 months under different nutrition levels of nature grazing conditions.