How to choose a kimchi jar: ①Press the jar into the water to see if there are any sand holes or cracks on the inner wall of the jar that may lead to water seepage. No seepage is good.　② half of the water in the altar along the edge, a roll of straw paper will be burned and put into the altar, cover the lid of the altar, the altar along the water can be absorbed into the inner wall of the altar lid, proving that the kimchi altar quality is better; the other way around is poor.　③ hit the altar with your hand, listen to the sound with your ears, the quality of the steel sound is good, the empty ring, sand ring, broken sound is second.