The nurse has to inject the patient with different drugs according to different injection methods. Different injection methods have their own rules, that is, the angle of needle entry, and for each injection method, the angle of needle entry is different. Intradermal injection requires the needle to be beveled upward and pierced at an angle of 5° to the skin; subcutaneous injection requires the needle to be beveled upward, at an angle of 30-40° to the skin, and quickly pierced into the skin; intramuscular injection method, also known as intramuscular injection method, requires the needle to be injected at a large angle, at an angle of 90° to the injection site, and quickly pierced into the muscle; intravenous administration, whether intravenous or intravenous drip, the angle of needle entry is also beveled upward and the skin at an angle of 15-30° angle, from the vein above or lateral stabbing into the subcutaneous, and then along the vein direction subtle stabbing into the vein. This is the angle of needle insertion. In the clinic among different injection methods, nurses must be proficient in order not to cause disputes between doctors and patients.