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13In this study, the effects of different tillage methods under wheat-corn two-course rotation 14 system on the some soil aggregation properties and yields were investigated. Experiment 15 was laid out in a split plot design with three replications during four crop years. Subsoiler, 16 moldboard, sweep and chisel as main plots and rotary tiller and disc harrow as sub-plots 17 have been used in this study. The results showed that tillage methods were significant at 18 (P<0.01) as regards crop yields, and the highest yields as 6249 and 11720 kg/ha for wheat 19 and 9891 and 73080 kg/ha for corn grain and biomass were produced in subsoiler treatment, 20 respectively. Subsoiler+rotarytiller treatment was significant at (P<0.05) with 2.063 mm as 21 to mean weight diameter (MWD) value. The subsoiler and chisel were statistically in the 22 same group with regard of water stable aggregates (WSA) value, and it was significant at 23 (P<0.05) with 67,83%. Bulk density, total porosity and air porosity values were significant 24 at (P<0.01), and 1.38 grcm -3 , 51.2% and 12.5% values were determined in rotary tiller 25 application, respectively. Field capacity (FC) and permanent wilting point (PWP) were 26 significant at (P<0.05) and (P<0.01) with 31.89% and 17.21% values in the chisel 27 treatment, respectively. Crop yields and positive effects on the physical properties were 28 considered subsoiler+rotary tiller treatment was the most successful, and it was followed by 29 chisel+rotary tiller treatment according to four-year study results. 30 31