1, medicinal use and efficacy: because of its hard flavor and aroma, it can dissolve dampness and stomach, can be used for the treatment of summer dampness and heat caused by, gastric distension, loss of appetite, abdominal pain and diarrhea and other digestive diseases, so it has always been loved by the people.

2, insect repellent. Because calamus grass has a peculiar aroma, not only does not attract mosquitoes, but also can drive mosquitoes to kill the effect of insects. It is a very good "green pesticide". Calamus rhizome 500 grams of mashed, add water 1-1.5 kg boiled for two hours, the original solution obtained by filtration, 3-6 kg of water, can effectively prevent and control rice fly, rice leafhopper, rice lacewing, aphids, red spiders and other insect pests.

3, warding off evil spirits and diseases. Folk believe that calamus has the role of warding off evil spirits, during the Dragon Boat Festival, hanging calamus on the door, followed the custom, and then into the Dragon Boat Festival custom. Jiangnan people every Dragon Boat Festival, hanging calamus, mugwort leaves in the doors and windows. Calamus wine, in order to get rid of the epidemic; summer and autumn night, burning calamus, ai leaves, mosquito and insect custom to maintain today.