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The efficiency of the composting process depends on the action and interactions of the microorganisms, which are dependent on favorable conditions, such as temperature, humidity, aeration, pH, types of organic residues used, carbon-nitrogen ratio and grain size of the residues to be used biodegraded. The granulometry is an important parameter to be considered, because the smaller the particles, the greater the area available to the microorganisms, creating mechanisms to accelerate the biodegradation process. Therefore, the objective of this research work was to evaluate the influence of granulometry on the aerobic treatment process of solid plant residues. The experimental work was performed in aerobic reactors of 48 liters of volumetric unit capacity, in two different treatments and three repetitions, totalizing 6 reactors. The solid wastes used were collected in the EMPASA, transported to the EXTRABES sanitation laboratory, and subjected to the unitary crushing, drying, and sieving operations in sieves of 5.5 and 7.0 mm. The physical and chemical parameters monitored were temperature, pH, moisture percentage, total volatile solids, and total organic carbon, taking into account APHA of basic recommendations (2012). The monitoring period was 45 days for treatment 1 and 55 days for treatment 2. It was found that there was no preponderant influence of particle size on the performance of the composting process or on the quality of the organic compounds produced. [ABSTRACT FROM AUTHOR]