In order to quantitatively evaluate the atmospheric environmental risk inside and around the chemical industrial park and implement risk management more effectively, the calculation methods of risk field strength and receptor vulnerability were optimized based on the technical idea of environmental risk field evaluation method. A set of cumulative atmospheric environmental risk assessment method was established based on the assessment unit of 100 m× 100 m. Taking a chemical industry park as an example, the atmospheric environmental risk in this area was divided into four levels, and the results were verified by the environmental protection report data. The results showed that the atmospheric environmental risk of the park evaluated by the established method was consistent with the actual situation. Thus the method could provide reference for environmental risk prevention and control of the park.