The results of studying the loading effect at low temperature air plasma action on the surface of fabric of polyethylene terephthalate filament yarns are presented. Gravimetric and mass-spectrum techniques were used in this work. Gas evolution changes plasma properties and, as a consequence, the target process kinetics. Due to the mutual influence of heterogeneous and volumetric processes not only flows of active oxygen particles on the material surface reduce but also the correlations of these flows change. The NO molecule concentration is closely connected with the atom oxygen balance. Even when the fraction of the reactor surface occupied by the fabric is relatively low, the NO molecules’ concentration drops appreciably. For a wide interval of discharge parameters, the specific rates of etching, the oxygen absorption from the gas phase, the gaseous product formation, and the NO molecule concentration decrease extensively when the reactor load ratio is increased from 6% to 50%. The interconnected influence of the parameters and the loading is shown in the behavior of the reaction product formation. In the case of the load ratio rising, the correlation of the degradation channels changes to a channel with a yield of CO and H2 stronger at higher initial gas pressure.