Abstract: In order to study effect on synchronization of estrus to recipient bovines about introduction time and nutrition, recipient bovines were synchronized with CIDR and Cloprostenol. Results indicated that synchronization rate was 93.75% and estrus usable rate was 90.69% to recipient bovines introduced before 3.5 months. But synchronization rate was 77.21% and estrus usable rate was 77.05% to recipient bovines introduced before 1.5 months. So synchronization rate and estrus usable rate were significantly different (p＜0.01＝between two group recipient bovines; Most recipient bovines within 48th hour were with significant estrus symptom after CIDRs were taken, and estrus rate of two group recipient bovines were 77.3% and 77.2%, respectively; Mean estrus rate and mean estrus usable rate of recipient bovines, which were served with fine feedstuff and others, were 80.37% and 79.23%, but mean estrus rate and mean estrus usable rate of recipient bovines, which were served with ordinary feedstuff and others, were 60.83% and 60.30%, so mean estrus rate and mean estrus usable rate were significantly different (p＜0.01＝between two group recipient bovines; Mean left corpus luteum rate of recipient bovines was 31.36%, whereas mean right corpus luteum rate was 68.64%, so significant difference (p＜0.01＝were between two group recipient bovines with different corpus luteum, furthermore, improved nutrition could raised right corpus luteum rate of recipient bovines. It is substantiated that introduction time over 3.5 months and improved nutrition before 1.5 months were very important to synchronization of estrus to recipient bovines.