NOVELTY - Quickly and thoroughly decomposing method for outdoor litter in autumn and winter, comprises choosing a clear place back to the wind direction and digging a pit; collecting litter; sampling the collected litter and counting the volume weight by sample basket method; putting the litter into the pit and processing the litter by microbial inoculum; piling up the litter in three layers; respectively spraying water, microbial inoculum and urine; well piling the litter up and covering the litter by shading net and compacting the litter; and turning over the pile when the temperature reaches 50 degrees C.    USE - Method of quickly and thoroughly decomposing outdoor litter in autumn and winter (claimed).    ADVANTAGE - By decomposing the litter under the ground, geothermal temperature can be fully used, which can largely reduce the influence of the outside low temperature on the temperature of the piled litter. Better effect of heat preservation, moisture preservation and fertilizer preservation are obtained, which can ensure the activity of the decomposing microbe so as to quickly achieve the thorough decomposing effect. The method solves the problems that the litter in artificial forest in northwest arid region is decomposed slowly under the natural condition and fire hazards are common and potential nutrient lose exists; is not limited by weather and region; solves the problems of material circulation and nutrient balance in the ecosystem of artificial forest in the arid region; and provides a new method for approximately natural management technology for the artificial forest.    DETAILED DESCRIPTION - Quickly and thoroughly decomposing method for outdoor litter in autumn and winter, comprises:    (A) choosing a clear place back to the wind direction and exposed to the sunlight near the forest land or in the forest land; digging a pit which is 1-1.2 m deep and 1.5-2 m wide, and whose length is not limited;    (B) collecting litter around the pit for decomposition when a large quantity of leaves fall in late autumn and early winter; where the litter includes fallen leaves, fallen flowers, fallen fruit, fallen branches and fallen barks, and relatively big branches can be crushed into relatively big granules by a crushing machine;    (C) sampling the collected litter and counting the volume weight by sample basket method; sampling for the second time and drying the litter at 65 degrees C till a constant weight, then detecting the water content; analyzing the contents of organic carbon (C) and total nitrogen (N) and calculating the using amount of urine when the ratio C/N is 25:1;    (D) putting the collected litter into the pit and processing the litter by microbial inoculum; piling up the litter in three layers, in which the first and second layers are 55-65 cm thick, while the third layer is 35-45 cm; respectively spraying water, microbial inoculum and urine; well piling the litter up and covering the litter by shading net and compacting the litter; and    (E) observing the temperature of the part which is 40 cm deep in the pile and turning over the pile when the temperature reaches 50 degrees C; after 30-35 days, the pile temperature is stable and the pile material is soft and friable when holding and kneading the litter with hand; and the pile color is black brown and the pile has a rotten smell; the thoroughly decomposed standard is met and pile decomposition is finished.