Gel electrophoresis apparatus is routinely used in the labratory to separate the mixture of charged macromolecules based on their molecular size. This tecnique is generally composed of power supply, electrophoresis tank, detection unit and so on. Electrophoresis refers to the movement of charged particles in an electric field. The movements of different materials in the electric field are at different rates because of their different electric charge and molecular weight. Therefore, electrophoresis can perform qualitative or quantitative analysis of different materials, or to a certain mixture components analysis or single component extraction preparation based on their size and charge. At present, electrophoresis apparatus is used in the separation and identification of proteins, peptides, amino acids, nucleotides, inorganic ions and other components, and even for the study of cells and viruses. This instrument is widely used in the undergraduate teaching including Experiment of Food Chemistry, Experiment of Food Analysis, Food Toxicology, Experiment of Microbiology Analysis, Modern Detection Techniques for Food, etc.