Abstract: The aim of the present study was to evaluate the production performance of hybrid offspring of Simmental and Zhongdian yak(Simmental-yak hybrids).The chosen female individuals of Zhongdian yak were subjected to estrus synchronization treatment and were artificially inseminated with the introduced frozen semen of Simmental bull.The main parameters associated with production performance of the Simmental-yak hybrids were assessed and compared with that of the hybrid offspring of local Yellow cattle and Zhongdian yak(local cattle-yak hybrids).The results showed that the calving rate of the female artificially inseminated Zhongdian yak was 59.26%,and the survival rate of the Simmental-yak hybrids was 75.00%;the average pregnancy duration of the Simmental-yak hybrids lasted for 271 days;the average body height,body slanting length,chest circumference,cannon circumference and body weight of the 6-month-old Simmental-yak hybrids were 89.3 cm,92.5 cm,115.0 cm,13.4 cm and 112.4 kg,respectively.Except for survival rate,the Simmental-yak hybrids had better performance in the other reproduction and production parameters than the local cattle-yak hybrids.