The paper presents the proposition of non destructive testing (NDT) of the rocket engine propellant rod. It presents the actual state of the research and perspectives of its continuation. In this research, capacitance tomography system was used. The method was compared with the radiological and radiometric methods. Experiments were done with the use of solid propellant with different pyrotechnic mass and artificial defects incorporated. Authors suggest a new method of differential tomography. (C)2000 Elsevier Science S.A. All rights reserved.