Mechanisms of resistant water aggregates forming were revealed. Investigation is indicated that forming of microaggregates is depending from the humus. The strength of micro-aggregates is decrease if allowance humus is reduction. Oxides of iron and organo-mineral combinations are participating in forming resistant water macroaggregates. If the soil, s employment is prolonged, the strength of macro-aggregates is decrease. Very important weight of the organic substance. Therefore improvement of the structure of soil is necessary the increase fund of organic matter.