Medical composition containing antifungal agent and succinate buffer liquid

The invention relates to a medical composition which comprises a) caspofungin in medical effective quantity or pharmaceutically acceptable salt, b) a pharmaceutically acceptable amount of succinate buffer liquid with the pH value of 4-7 and c) a pharmaceutically acceptable amount of excipient. The medical composition provided by the invention is high in stability, good in safety, convenient to use, simple in preparation process and suitable for industrial production.