A laboratory experiment was carried out in Agriculture College-Anbar University (Abu-Ghriab) in silty clay loam soil in order to study the effect of organic matter extract on the some physical properties of soil. Data were statistically analysed using factorial arrangement in CRD with three replicates for each treatment. The first factor was organic matter extract and the second factor was wetting-drying sequences. The treatment of organic matter extract was divided into two sub treatments, complete addition and partial addition at 5% organic matter as well as control (without addition). Statistical analysis results showed a significant increase in mean weight diameter at two methods, fast and slow wetting and decrease in bulk density and increase porosity in addition treatments. Wetting-drying cycles significantly affected on the average of mean weight diameter at two methods, fast and slow wetting, bulk density and porosity. Soil aggregates that treated with organic matter extract under scanner electronic microscope showed bigger aggregates in size while non treated soil showed smaller aggregates in size.