1.Patients with a thin body should consider using a 45-degree needle (you can also consider using a 31G*5mm or 32G*6mm needle); 2.Injecting sites, try to avoid having two or more injections in the same place (about 2*2cm area) in a month; 3.If the abdomen and outer thighs are injected alternately, apply appropriate heat to the intermittent parts to 4. Do not inject in areas with hard knots; details of injection technique: A. Pinch up the skin (the strength of the hand should be appropriate when pinching up, not too tight); B. 45 degrees into the needle (needle into the general emphasis on fast, even experience is not necessary, slow into the needle should be better to avoid the occurrence of broken needle accidents. (To avoid pain, you can first try to tie the needle with the tip of the needle, encounter too much pain, change the location.) C, push the drug this should be appropriate slower; D, while pushing the drug, while gradually and properly relax the pinched skin. This step is the focus, need to pay attention to is “gradually appropriate relaxation”, not a relaxation, not completely released; E, out of the needle (out of the needle is also generally stressed fast out, even the experience or unnecessary. Needle out need to pay attention to is, along the opposite direction of the needle out, do not distort the needle, one is to avoid expanding the wound, the second is to avoid the needle to pout broken).