Castor oil is a purgative extracted from the seed of the castor plant; used in paint and varnish as well as medically. The castor oil has the characters of stabilization, lubricity, wettability which would be provided in industry. The biological nature of laxation, defaecation, scald curing would be applied in the medical care. However, it must be avoid contact with skin and eyes, because it contains some toxin. The direct eating of castor will lead to poisoning even death. As for the treatment of chalazion, we could use the medicine combined with hot compress. Eye drops and ointment will be enough to treat the one which below 4mm's diameter one. If the situation is serious, the surgery will be the best way to cure, or even lead to scar after the self-healing.