Introduction: Sarcosystis is one of the most common parasites between humans and livestock that is create by various species of sarcositis.Some species of this parasite cause anorexia, weight loss, reduced milk production, muscle weakness, abortion, and sometimes death of host mediators such as cow and sheep.Pollution occurs in humans when it consumes meat and products from infected animals in raw or semi-raw form.This disease causes a lot of economic damage to the husbandry industry. Targets: The aim of this study was toanalize pollution of sarcosystisin livestock in the slaughterhouse whichprovide protein that people need in hamedan. Research Methodology: In this study conducted, in the autumn season of 1397, 111 specimens were obtained randomly from Hamedan's slaughterhouse.16 cows،65 sheep ،30 goats samples were collected.The age of cows was between 15 months and 2 years, and the age of sheep and goats was 9 months to 1.5 years.94 heads of livestock, female sex (84.68%) and 17 heads were male (15.31%).In this study, the esophageal, aperture and muscle were examined for microscopic cysts by digestive method.The samples were digested with digestion method by normal saline after transfer to the lab and Centrifuged 2000round pair two minutes .Then from end of the test tube take a drop sediment checked on the lam for searching about bradyzoites. Conclusion: The percentage of microscopic cysts in cows was 6 (37.5%)،(25%) is muscle and 75% aperture pollution،The sheep are 50 cases (76.92%).74.41% of the infection was muscle and 84.61% of the aperture and 77.77 of the pollution of the esophagus،And in goats there are 27 cases (90%).75% pollution is muscle and 100% aperture pollution and 85.71% of the esophagus was observed.In the digestive method, the highest infected tissue was detected with aperture value (93.1%) and the lowest infection muscle tissue was detected 65.67% final conclusion: These results indicate high rates of pollution parasite in livestock that is nee
