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Historically it happen so that in branches of physics connected with fieldtheory and of physics of material systems (continuous media) the concept of"conservation laws" has a different meaning. In field theory "conservationlaws" are those that claim the existence of conservative physical quantities orobjects. These are conservation laws for physical fields. In contrast to thatin physics (and mechanics) of material systems the concept of "conservationlaws" relates to conservation laws for energy, linear momentum, angularmomentum, and mass that establish the balance between the change of physicalquantities and external action.  In the paper presented it is proved that there exist a connection between ofconservation laws for physical fields and those for material systems. Thispoints to the fact that physical fields are connected with material systems.Such results has an unique significance for field theories. This enables one tosubstantiate many basic principles of field theories, such as, for example, theunity of existing field theories and the causality. The specific feature offield theory equations, namely, their connection to the equations for materialsystems, is elicited. Such results have been obtained by using skew-symmetricdifferential forms, which reflect the properties of conservation laws.

Two types of conservation laws. Connection of physical fields with material systems. Peculiarities of field theories