Calcium chloride is usually an injection, and its main function is to treat Ca+2 deficiency in the blood, especially when the patient has hand and foot convulsions, a typical manifestation of low calcium. For some patients with allergic diseases, it can also be treated, such as when the diagnosis of allergic purpura is made and there is an allergic rash all over the body, calcium chloride injection can be applied. There are also some cases of poisoning, like magnesium ion poisoning, which can be treated by applying sodium chloride injection for detoxification. For cardiopulmonary resuscitation, sometimes Huagai injection is applied to give resuscitation treatment. However, at present, among the fluids for calcium supplementation, calcium gluconate injection is relatively more. Calcium chloride should generally pay attention to the drug deposition, and the drug should not be overdosed, and not too fast application, static point, injection, can not be applied too fast, will lead to a sudden rise in calcium organism problems.