People regard food as their prime want , coz food industry is one of the most industry closely related with people's life.The whole process of food industry is associated with the use of a variety of scientific instruments. From the initial selection material, inspection and quarantine departments all need to analyze scientifically for the food raw materials. Such as the test of protein content in the milk, grape’s sugar content and pesticide residue detection. In the procedure of food processing, generally we need to precisely control the temperature, humidity, and even the content of material (alcohol, sugar, etc.) . Therefore we all need to use high-tech instruments. When production is completed, we also need to accurately analyze it’s nutritional ingredient, and then we will be able to rate the food.