Abstract: In order to understand the infection status of bovine parasites in large-scale cattle farms in some areas of Inner Mongolia, an epidemiological investigation on bovine parasitic diseases in the cattle farms in Hohhot and Xilin Gol League of Inner Mongolia from 2015 to 2017 has been undertaken using saturated brine floating method, centrifugal sedimentation method, McMaster′s egg counting method, serologic method and immunological method. The results showed that the most commonly observed parasites were Trichomonas nematodes and Eimeria; the presence of Neospora caninum was found in 2015 and the metastrongylidae detection was positive in some individual cattle farms; the pathogen detection of trematode, cestode, blood protozoonoses and Trichomonas was negative. During the three-year investigation, the parasitic infection rate in the surveyed cattle farms showed a significant downward trend after the targeted treatment. The obtained data provide useful information for understanding the infection status of bovine parasites and controlling the parasitic diseases in these regions.