Aiming at the current situation of climate warming and regional heavy haze events caused by the discharge of greenhouse gases and pollutants in the industrial process, the paper puts forward the carbon emission measurement and environmental impact assessment method based on LCA. The LCA method is used to analyze the carbon emissions of the industrial process, and the carbon equivalent of each unit in the process has been well calculated. Meanwhile, the GaBi software was used to evaluate the environmental impact of the industrial process,and the heavy pollution unit in the complex process has been located precisely. Based on the study of two kinds of alkali products in Sunite factory, it is shown that these two methods are both feasible for the analysis of industrial process and the results of the analysis are of great reference value for the industrial process improvement.