Abstract: Objective To investigate and analyze the radiation dosage around the working environment in radiotherapy centre affiliated to Sichuan cancer hospital in the western China.Methods In 60 days,we have continuously monitored the accumulated dose that absorbed by doctors,nurses,technicians,physicists and engineers,and investigated the working environment ⁶⁰Co unit,accelerator,after loading unit,X-ray simulator,CT simulator,gamma knife,MRI and doctor's office)and external environment by using TLD,and compared our results to those released by relevant departments.Results The average dosage in the working environment is 1.96 μC·kg^-1·month^-1,1.61 μC·kg^-1·month^-1 in external environment.Conclusion In the past 25 years,the radiotherapy center constructed strictly by the criterions of environment and protection departments required,so the radiation dosage in or outside the radiotherapy center has reached the national standard,which is safe for the staff and patients.Its instatement that the radiotherapy sites constructed by the related laws well accorded with the safety standards regulated.