At present, there are iodized salt, refined salt, low-sodium salt and low-potassium salt on the market. The common types of table salt available in the market mainly include snowflake salt, iodized salt, refined salt, low sodium salt and low iodized salt. Snowflake salt is made from seawater, and compared to other types of salt, sea salt contains trace elements that are more easily absorbed by the human body; iodized salt is the most common and commonly used type of table salt. In order to prevent iodine deficiency, a certain dose of potassium iodide and potassium sulfate is added to common table salt to make iodized salt. Generally, it can be consumed by all kinds of people. Fine salt, is the original salt after the removal of impurities, again crystallized salt, can be used as ordinary life in ordinary seasoning; low-sodium salt, low-sodium salt is iodized salt as raw material, added a certain amount of potassium chloride and magnesium sulfate, to improve the body’s balance of sodium, potassium, magnesium, is more suitable for middle-aged and elderly people and people suffering from high blood pressure disease. As long as the market regular sales of salt are edible, just different types of salt is more suitable for a certain type of people, it is recommended to choose according to their own situation.