There are three main aspects of treatment for drainage fluid to be drained after breast cancer surgery, one of which is to change the external dressing diligently; the second is to give sufficient anti-bacterial drugs for anti-infection treatment; and the third is to give negative-pressure drainage if necessary. 1. Because breast cancer will subsequently form a cavity, and there will be continuous flow of plasma before closure, the external dressing will be easily wet, which will affect the discharge of drainage fluid, so it is necessary to change the external dressing diligently, which will be conducive to the clean drainage of drainage fluid. 2. Part of the drainage fluid is caused by bacterial infection in the cavity, which belongs to inflammatory exudation, and patients need to be given relevant antibacterial drugs for anti-infection treatment on the basis of dressing change, such as amoxicillin, levofloxacin, and so on. 3. For the above two ways are not effective, can also be negative pressure drainage, through the negative pressure attraction, can promote the drainage of the cavity of the outflow, and easier to make the cavity to achieve closure, and then make the drainage of water clean. The specific situation is recommended to go to the hospital, consult a professional physician.