The problem of oil volatilization caused by the opening of the oil metering guide pipe in the in-ner floating roof tank was analyzed.By constructing a three-dimensional model and using the principle of fluid mechanics similarity for numerical simula-tion,the oil volatilization status of the inner floating roof tank at different temperatures in winter and sum-mer was studied.The oil inlet hole can cause the volatilization of the oil product,and it needs to be considered during oil storage.