Abstract: Application of 15 m2 scraped film evaporator in caprolactam production，which has already been localized in China，was calculated using Komori analytical model and basic heat transfer models combined with related physical and operating parameters of the equipment in actual production. Results from the theoretical model calculation were then compared with those from actual operation，and the deviations were thus discussed including those from operational parameters such as feeding flux and temperature，and those from the production process.