Abstract: Many detection methods of deep frying oil were summarized and compared in this paper. Sense evaluation is the most simple and straightforward,but it is not exact and difficult to quantify the degree of change of oil because frying foods are intricacy . The sensor array fingerprint technology is speedy and exact,while the apparatus are expensive and not befitting in the small and medium-sized food industry. The detection of viscosity and the height of bubble are not only simple,but also cheap. It is suitable in the small and medium-sized food industries.

Key words: food industry, deep frying oil, detection, sensory evaluation, sensor array fingerprint