NOVELTY - A simulation device comprises aerobic composting simulation reactors, each of which is internally provided an oxygen concentration sensor and a temperature sensor. Both sensors are connected with a data collector through data wires. Output end of the data collector is connected with a display terminal through a data wire. Each aerobic composting simulation reactor has an air pump which is communicated to interior of corresponding aerobic composting simulation reactor through a vent pipe. Air outlet of each air pump has a flow meter.    USE - Simulation device used for simulating organic solid waste aerobic composting process (claimed).    ADVANTAGE - The device occupies less space, has low cost and no pollution, and is capable of optimally aerobically composting different materials in short period.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for using the device for simulating aerobic composting process, comprising:    (A) performing assay on moisture content, carbon-nitrogen ratio and pH value to selected composting material and additive;    (B) mixing composting material, additive and water, where water content of the mixed material is 55-755 and carbon-nitrogen ratio of the mixed material 15-30;    (C) dividing the mixed material into several parts, respectively placing each part in one aerobic composting simulation reactor, then inserting an oxygen concentration sensor and a temperature sensor in the material of the simulation reactor, and closing the simulation reactor;    (D) starting air pump to supply air to the simulation reactor at ventilation rate of 0.1-0.8 L air/(minute.kg volatile solid), controlling oxygen concentration in the simulation reactor to greater than 8% and temperature to greater than 50 degrees C continuous or discontinuous rotation of air pump;    (E) opening each simulation reactor according to set time interval in the composting process, taking out the oxygen concentration sensor and the temperature sensor, pouring the material out to mix uniformly and obtaining sample, then refrigerating the sample at low temperature;    (F) placing the remained material back into the simulation reactor, inserting the oxygen concentration sensor and the temperature sensor, and closing the simulation reactor;    (G) when composting is ended, opening each simulation reactor, taking out the oxygen concentration sensor and the temperature sensor, and pouring out the material to mix uniformly and obtaining sample; and    (H) assaying and recording the water content, carbon-nitrogen ratio, organic matter and pH value of the samples, and recording the sensory index of the sample, comprising color, granularity and smell.