1, the drainage tube should be 20-30 cm below the wound site, do not squeeze the drainage tube to prevent retrograde infection. 2, to avoid drainage tube pulling, folding, twisting, pressure, to keep the drainage tube unobstructed. 3, observe the color, quality and quantity of drainage fluid, and dump the drainage fluid in a timely manner. 4, keep the dressing around the drainage tube dry, such as the following conditions should be promptly to the local hospital: dressing contamination, drainage tube blockage, prolapse, drainage fluid suddenly increased, bright red color, the need to replace the drainage tube to the hospital treatment.