ObjectiveTo monitor the Salmonella contamination in the whole process of hatching,cultivation,slaughtering, processing,distribution and retail,and to analyze and assess the correlation between Salmonella and serotypes． Methods 802samples from 18segments,including soil,feces,chicken,slaughtering facility and the worker''s hands,were collected from breeding farm,broiler hatchery,slaughterhouse and supermarket．All samples were tested according to GB 4789.4－2010and the data were statistically analyzed with SPSS 17.0software． ResultsThe positive rate of Salmonella was 75% in the pool used for depilation,while it was 58.3%,49.4%,33.3％,5.6% in feces,chicken,cutting tool and anal swab,respectively．The detection rate for chicken embryo and transport vehicles was 0．Six serotypes were detected,with the highest detection rate in Salmonella Enteritidis and Indiara Salmorella the second quarter had the most diverse serotypes． ConclusionThe slaughtering and processing made Salmonella spread and the machine and pool used for depilation was the key of cross contamination．The positive rate had no significant difference(P>0.05)between seasons．\=