Cannabis beans can't be eaten after 5 days, which is poisonous. On the fourth day after curing, the content of ammonium nitrite in the sword bean was the highest. On the tenth day, the content of nitrite in kimchi began to decrease obviously. After 2 days, the content of nitrite decreased obviously, and it was safe after one month. Therefore, the content of ammonium nitrite is very high when the sword bean is marinated for 5 days, which is toxic and inedible.