Yunnan Baiyao aerosol is composed of Radix Notoginseng and Rhizoma Paridis. Yunnan Baiyao aerosol is used for promoting blood circulation, removing blood stasis, reducing swelling and relieving pain. Used for traumatic injury, muscle soreness and rheumatic pain. So, Yunnan Baiyao aerosol has expired for one year, can it still be used? Yunnan Baiyao has a history of 100 years since its establishment. It sells well at home and abroad for its magical curative effect, and its formula is still a secret in the field of economic intellectual property rights of China government. In recent years, Yunnan Baiyao aerosol (white bottle) and Yunnan Baiyao aerosol insurance solution (red bottle) processed by modern preparation technology are playing an increasingly important role. Because Yunnan Baiyao aerosol is more effective and convenient than traditional powder in treating acute soft tissue sprain and contusion. The expiration date of a drug refers to the approved use period of the drug, which means that the quality of the drug can be guaranteed under the specified storage conditions. It is one of the indexes to control the quality of drugs. The validity period of drugs should be based on the validity period indicated on the drug packaging instructions. The service life of Yunnan Baiyao aerosol is three years. Yunnan Baiyao aerosol has expired for one year and cannot be used. Yunnan Baiyao aerosol solution has rapid analgesic effect. In case of severe closed traumatic injury or acute traumatic injury, the pain is severe and unbearable, and the skin is not broken, Yunnan Baiyao aerosol insurance solution can be used immediately to relieve the pain quickly, and then Yunnan Baiyao aerosol can be used until it is cured. For non-acute injuries such as rheumatic pain and muscle soreness, Yunnan Baiyao aerosol can be used alone for treatment. In addition, if the skin is damaged and hurts again, only Baiyao aerosol can be used, which has a good hemostatic effect. The author reminds me warmly that Yunnan Baiyao aerosol is helpful for traumatic injury, hemostasis, analgesia, promoting blood circulation and removing blood stasis.