Rangelands are precious natural ecological resources and occupy the largest area of terrestrial lands in the world. Rangeland with diverse plant species is a natural ecosystem rich in genetic resources. Biological diversity is responsible for the sustainability of rangeland ecosystems against biological and environmental variables. Firing is considered important among several factors affecting the biological diversity in rangelands. Controlled firing is considered as a management strategy to improve the rangeland ecosystems. However, it might be a destroying agent for forests and pastures in arid and semi-arid regions. The objective of this study was to investigate the residual effects of firing events on soil texture, carbonate content, organic matter (OM), particulate organic matter (POM), hot-water extractable carbohydrates (Cb HW ), structural stability indices (MWD, GMD and WSA), organic carbon (OC) and total nitrogen (TN) and C/N ratio in the physical fractions of aggregates in the rangelands of Fereydan region, Isfahan Province. Ten stations per year were selected from the fire events of 2008 to 2011, whereas five stations were studied in 2012 because of low number of 2012-fire events. In each location, a treatment plot (burn) and control plot (unburn) were selected and the soil sampling and measurements were done in the border between burn and unburn plots in order to minimize the influence of spatial variability on the results. Therefore, 45 samples from burn locations and 45 samples from corresponding unburn locations (in total 90 locations) were collected and brought to the lab. The statistical comparisons between fired (F) and non-fired (NF) locations at each year were examined using paired t -test. The residual effect of firing upon time on the OC and TN of aggregates (physical fractions) was studied using factorial arrangement in an unequal completely randomized design. The results showed that fire and time after firing significantly increased OM, Cb HW , TN and contribution of all aggregate fractions to total soil organic carbon. The fire significantly increased total POM and occluded POM but the increase in free POM was not significant. On a relative basis, the fire decreased the POM (i.e. POM/OM ratio) and Cb HW (i.e. Cb HW /OMratio), indicating the sensitivity of these properties to soil management. Soil structural stability indices (MWD, GMD and WSA) were significantly increased after fire due to greater OM, POM and Cb HW . However, time after firing decreased the differences of MWD, GMD and WSA between burn and unburn locations. Firing significantly decreased the mean percents of primary particles + very fine aggregates ( 0.053 mm) but non-significantly decreased the water-stable micro-aggregates (0.053?0.25 mm). However, the water-stable macro-aggregates (0.25?4 mm) were significantly increased after fire. The effects of time after firing and aggregates size on OC and TN of aggregates were significant but their effects on C/N ratio were not significant. The fire increased the C/N ratio but the effect was significant in some years. The findings of this study indicated that controlled firing in rangelands of Fereydan region in locations on north- and east-facing low slopes with loamy soils might improve soil quality and physical and chemical properties if livestock grazing is prevented and/or controlled. Keywords: Firing, Aggregate, Structural stability indices, Hot-water extractable carbohydrates, Water infiltration, Free and occluded particulate organic matter, C/N ratio.