PURPOSE: A method for producing a large amount of Miscanthus sinensis from immature flowers is provided. CONSTITUTION: A method for producing a large amount of Miscanthus sinensis from immature flowers of Miscanthus sinensis comprises: a step of culturing the immature flowers in a medium containing MS medium, 2,4-D(dichlorophenoxyacetic acid), benzyl adenine, sucrose, and medium solidifying agent to induce callus a step of increasing the callus in a medium containing MS medium, 2,4-D, benzyl adenine, sucrose, and medium solidifying agent a step of reproducing a shoot from the callus in a medium containing MS medium, naphthalene acetic acid, benzyl adenine, sucrose, and medium solidifying agent and a step of elongating and rooting the shoot.본 발명은 억새의 미성숙 화기로부터 기관형성을 통한 억새 식물체 대량 생산 방법, 상기 방법에 의해 생산된 억새 식물체 및 상기 억새 식물체를 가공처리하여 바이오에탄올을 생산하는 방법에 관한 것이다.