NOVELTY - Increasing anaerobic gas-producing speed of wood fiber raw material involves carrying out pre-treatment of wood fiber raw material by cutting the wood fiber raw material. The pre-treated wood fiber raw material is put in an anaerobic reactor and 5-30 wt.% of incisions and water are added. The total solids (TS) load of the anaerobic system is adjusted to 20-30% for generating marsh gas by anaerobic fermentation reaction at 30-40 degrees C. The TS load of the anaerobic system after 1-2 weeks is adjusted to 14-16% with 1-5% of ammonium bicarbonate solution.    USE - Method for increasing anaerobic gas-producing speed of wood fiber raw material (claimed).    ADVANTAGE - The wood fiber raw material anaerobic gas-producing speed increasing method relatively increases the anaerobic gas-producing speed and allows gas-producing speed of the wood fiber raw material in a large margin with a less changed anaerobic fermentation cycle, and increases the treating capability of the anaerobic reactor and the gas-producing capability of the wood fiber raw material by more than 80%, thus enhancing the economical efficiency and feasibility of anaerobic treatment of the wood fiber raw material.    DETAILED DESCRIPTION - Increasing anaerobic gas-producing speed of wood fiber raw material involves carrying out pre-treatment of wood fiber raw material by cutting the wood fiber raw material. The pre-treated wood fiber raw material is put in an anaerobic reactor and 5-30 wt.% of incisions and water are added. The total solids (TS) load of the anaerobic system is adjusted to 20-30% for generating marsh gas by anaerobic fermentation reaction at 30-40 degrees C. The TS load of the anaerobic system after 1-2 weeks is adjusted to 14-16% with 1-5% of ammonium bicarbonate solution. Anaerobic fermentation reaction is continued and the reaction is finished when the gas-producing amount decreases after anaerobic fermentation process of 50-80 days. The incision is selected from dregs of marsh gas pool, putrescent river mud or anaerobic digested sludge of sewage treatment factories.