The invention discloses a
flos chrysanthemi indici effective ingredient, which is extracted by a method comprising the following steps of: 1) taking
flos chrysanthemi indici, adding 60-90%
ethanol which is 5-10 times of the weight of the
flos chrysanthemi indici to extract, filtering the extracting solution, and concentrating the filtrate into extract; and 2) adding water into the extract to prepare suspension, adding extract liquor to extract, and recovering the extract liquor to obtain the
flos chrysanthemi indici effective ingredient. Experiments show that the
flos chrysanthemi indici effective ingredient can more obviously inhibit
hepatitis B
virus, can also inhibit the glutamic-oxalacetic transaminease (AST) and glutamic-pyruvic transaminease (ALT) indexes of liver serum of the damaged liver, can reduce the
tumor necrosis factor (TNF) content, liver indexes and
malondialdehyde content of the liver serum of the damaged liver, and has good liver protection function. The
flos chrysanthemi indici effective ingredient can be used as the
active ingredient, and can be prepared into anti-
hepatitis B
virus medicaments or compositions with the liver protection function, such as food, drinks, health care products, drugs and the like, and the medicaments or compositions can be prepared into tablet,
capsule,
powder, injections and any other medically acceptable formulations.