Hard capsule is a quantitative extract of herbs plus powder or excipients made of uniform particles or powder filled in the hollow capsule; soft capsule, also known as gelatin pill, will be liquid drugs or liquid-solid drugs filled in the soft capsule material after treatment and become. Hard capsules are used for water-soluble drugs, light-sensitive, unstable drugs in the presence of moisture and heat has a protective effect, to prevent decomposition in the presence of light, the capsule material can cover up the bad smell of the drug, easy to swallow and absorb, can be positioned at regular intervals to release. Soft capsules are mostly used for oily drugs and low melting point drugs, commonly used in drugs or health food, light-sensitive, unstable in the presence of moisture and heat, easy to oxidize the drug is suitable, can also be made into rectal suppositories, can improve the bioavailability of poor bioavailability of hydrophobic drugs bioavailability, compared with the hard capsule, the soft capsule of the dosage of some more.