Objective In order to study the incidence of malignant tumour among vinyl chloride workers. Methods A cohort study was performed on the death causes of 921 vinyl chloride workers for a period of 40 years. Results It showed that the mortality rate of liver cancer in male demonstrated excess amount of exposure as compared with control group, the RR were 2.16(P<0.05). The mortalities of malignant tumour and liver cancer in male and female group were demonstrated excess as compared with the population of the same region. The SMR from malignant tumour and liver cancer were 1.8 and 2.9(all P<0.05) respectively. In the percentage of malignant tumour, the first was liver cancer. Conclusion The excess of liver cancer among the vinyl chloride workers might have their occupational characteristics.