Abstract: ⁶⁰Co source radiation facility is an important equipment to produce reference radiation filed, according to national standard, the scattered doserate must be less than 5% of the total doserate in the reference radiation filed. Scattered radiation contribution and uniformity of reference radiation field are important parameters to describe the radiation performance of ⁶⁰Co source irradiation device, Monte Carlo method was used to study the scattered radiation and uniformity of the reference radiation filed to provide theoretical basis for the design of ⁶⁰Co source irradiating device in order to avoid economic losses caused by design mistakes. When ⁶⁰Co source irradiating device was manufactured, PTW ionization chamber was used to measure the irradiation field. The results showed that the scattered radiation and uniformity of the radiation filed were in good agreement with the simulation results. The radiation performance met the design requirements.