Pharmaceutical for treating idiopathic edema and preparation methods thereof

A pharmaceutical for treating idiopathic edema containing Radix Angelicae Sinensis 159-240 parts, Radix Bupleuri 106-160 parts, Poria 212-322 parts, Rhizoma Alismatis 126-192 parts, Radix Paeoniae Alba 126-192 parts by weight. Preparation methods of said pharmaceutical are also provided. Said pharmaceutical has effects such as diuresis, lowering permeability of capillaries, improving microcirculation disorder, enhancing immune function and so on.