GB/T 18 186 is the standard number of soy sauce products issued by China National Standardization Administration Committee, which stipulates the quality requirements, production technology and inspection methods of soy sauce. Choosing soy sauce that meets this standard can ensure the quality and safety of products. Soy sauce brewed from pure grains is usually healthier and more natural because it contains no chemical additives. The prepared soy sauce may contain some chemical additives. For consumers who pursue health, soy sauce brewed with pure grain is more ideal. Soy sauce has the functions of seasoning, color enhancement and freshness enhancement in the kitchen. Seasoning means that soy sauce can provide unique flavor and taste for dishes, color enhancement means that soy sauce can give dishes a deep color, and freshness enhancement means that soy sauce can enhance the umami taste of dishes. Choosing soy sauce that meets GB/T 18 186 standard can ensure its good seasoning effect, color and umami flavor.