The problems of using liquid metal blanket and contact devices of thermonuclear reactors. The different methods to reduce the pressure drop in liquid-metal coolant tichenii in a magnetic field for the main reactor blanket fixtures. The peculiarities of the flow of conductive media in high magnetic fields on the basis of experimental data the conditions of transition to the linear flow regime in the characteristic elements of the duct blanket, consider ways of heat transfer in the blanket, allowing to reduce thermomechanical stresses and reduce the flow of molten metal by aligning the profile of temperature and growth heat transfer coefficient.