Abstract: As a non-invasive drug delivery method, nasal drug delivery has many advantages, such as rapid onset, easy use, high compliance, no first pass effect, fewer adverse reactions, mucosal immunity, and provides a new convenient route to deliver drugs to the brain through nose-to-brain delivery. Nasal formulations are increasingly becoming a research and development hotspot, focusing on addressing unmet clinical needs. However, due to the special structure and physiology of the nasal cavity, there are still many challenges in the development and evaluation of nasal preparations.