As a result of complex physical-chemical researches the data characterizing interaction of nanoparticles Pd(()) with a polycaprolactam matrix, undergoing destruction in conditions of synthesis of a composite have been obtained. The structure of nanocomposite and, the features of morphology of the metal particles stabilized by PCL have been studied. The size metal-containing  particles in structure of composites and their distribution by the sizes have  estimated.