Analysis: magnesium sulfate has the effect of anti-inflammatory swelling, so 50% magnesium sulfate solution hot compress the affected area can reduce swelling. Suggestions: Method: Take the prepared 50% magnesium sulfate solution heated to about 40 ℃, soak gauze block, take out and slightly wrung out (to not drip as degree), compress cover in the affected area, and then covered with a layer of plastic film, also can be pressed with a hot water bag to enhance insulation. Method introduction: with a wet towel preferably gauze folded, the solid magnesium sulfate poured in the thin inner layer (mainly considering the poor water solubility of magnesium sulfate, especially when the concentration is high), the thin layer on the affected area, outside with a hot water bag or mineral water bottle heated. When the water is slightly cool, you can remove the upper layer of gauze, directly in the thin inner layer to continue heating. This is how I got it, the effect can be, and save time. If the drug is more irritating, do not choose the hot compress, because the hot compress to promote local blood circulation, expand the local exudate area. If the swelling is serious, available 50% magnesium sulfate wet compress. Hospital pharmacy or ordinary pharmacy can buy, powder can be saline or injection water preparation, using intermittent wet compress, should not be continuous compress. 50% of magnesium sulfate solution is a hypertonic solution, the principle of action is through the permeation of magnesium ions, improve the tissue interstitial and intracellular osmotic pressure, so as to achieve the absorption of local tissue exudate and swelling. Mix magnesium sulfate and water according to the mass ratio of 1:1, and cover the affected area with 50% magnesium sulfate solution soaked with gauze. Preface: [Objective] To summarize the application effect of magnesium sulfate wet dressing with and without cling film outer wrapping in the treatment of chemotherapeutic phlebitis. [Methods] 74 patients with chemotherapeutic phlebitis were randomly divided into observation group and control group, 37 cases each. In the observation group, the affected area was covered with 50% magnesium sulfate solution soaked in wet gauze and wrapped with cling film, so that the magnesium sulfate gauze always kept a certain humidity, while in the control group, the affected area was covered with 50% magnesium sulfate solution soaked in wet gauze. [Results] The treatment effect of the observation group was significantly better than that of the control group (P<0. 05). [Conclusion] The efficacy of magnesium sulfate wet dressing plus cling film outer wrapping in the treatment of phlebitis was determined, and it is one of the effective methods in the treatment of chemotherapeutic phlebitis.