NOVELTY - A bidirectional ventilating and air pressure pile-turning composting method involves stacking block whose height is 2-2.5 m and whose upper part has empty space of 0.5-1.0 m in box composting reactor, inserting three thermographs and three sampling pipes of clearance gas in the block; implementing ventilation according to fixed 0.1-0.2 m3/minutes input air per m3 original composting raw material and intermittent method, where when maximum difference in thermographs temperature is more than 5 degrees C, draft direction is changed; and carrying out pile-turning from second day of composting.    USE - As bidirectional ventilating and air pressure pile-turning composting method useful for dealing with the home scrap, agricultural wastes and mud in the sewage treatment works.    ADVANTAGE - The facilities and the running cost are lower and there is no secondary pollution. So the composting quality is guaranteed.    DETAILED DESCRIPTION - A bidirectional ventilating and air pressure pile-turning composting method involves stacking block whose height is 2-2.5 m and whose upper part has empty space of 0.5-1.0 m in a box composting reactor, and inserting three thermographs and three sampling pipes of the clearance gas in the block in different height; implementing ventilation according to fixed 0.1 to 0.2 m3/minutes input air per m3 original composting raw material and the intermittent method, where when the maximum difference in temperature of three thermographs is more than 5 degrees C, the draft direction is changed; and carrying out pile-turning from the second day of the composting and is done each day, where the air is compressed by the impulse and is released instantaneously so that the block in the reactor floats upwards and then falls down for the attack. After each pile-turning, the oxygen concentration of the air in the block is measured per 15 minutes. When the maximum difference value of adjacent two times is less than 1%, the block oxygen consumption is steady and composting is finished. The three thermographs are inserted apart and vertically to the height of 1/4, 1/2 and 3/4 of the block. When the volume fraction of the oxygen of the clearance gas in the block is less than or equal to 5%, it is cycled after ventilating for 15 minutes. When the average temperature of the block is more than 60 degrees C it takes a clearance for 30 minutes and then cycle after ventilating for 20 minutes. When the maximum difference value of the reading of each thermograph is more than 5 degrees C, the ventilation direction is changed immediately.