Micropigmentation injections are respected by many doctors and beauty seekers for their many advantages such as quick, safe and scarless. The injection needle includes sharp needle and blunt needle, which is one of the details of hyaluronic acid injection and affects the effect of injection, comfort, bruise occurrence and other aspects. At present, most doctors in China still use the traditional sharp needle for injection. Blunt needle is a new injection method that was first introduced in the West nearly six or seven years ago and gradually accepted by injection doctors. However, everything has its two sides, that is, there are both advantages and disadvantages. The only way to avoid the disadvantages is to use a combination of the advantages and disadvantages. Here I will introduce the advantages and disadvantages of sharp and blunt needles respectively. Sharp needle advantages and disadvantages: 1, advantages: accurate positioning, easy to control, certain parts (injected deep) good results, short operation time. 2, disadvantages: puncture pain feeling heavier than blunt needle, the chance of bruising than blunt needle, need more than one needle eye to achieve good results, the transition area is difficult to operate compared to blunt needle, easy to appear uneven, the chance of piercing into the blood vessels is slightly larger than blunt needle. Blunt needle advantages and disadvantages: 1, advantages: puncture pain is light, easier to operate, good effect in the transition area, no risk of piercing the blood vessels. 2, disadvantages: positioning is slightly worse than sharp needles, especially deep injection is more difficult to control, operation time is slightly longer, multiple punctures on tissue damage than sharp needles, the relative recovery time is slightly longer. Comprehensive safety, effect, operation time and other comprehensive factors, should be a comprehensive choice of sharp needle or blunt needle operation, the strengths and weaknesses to avoid, to achieve the best results and the safest injection.