The article is concerned with characteristics of regulating stocks in provisions uncertainty and it describes some modern methods of theory stocks. The theoretical knowledge are verified on actual system of supply in the factory Stavomontáže Kovo Sklo Ltd. The cardinal part of project is engaged in the optimalisation of stock and the calculation of the reserve stock for chosen kind of materials. Also we present results of research for the given factory in the supply´s sphere - comparison amount of calculated reserve stock with actual stock level and the suggestion of measures. By this suggestion of measures we started from the given calculation.