This paper gives the results of a numerical study of the plasma physics parameters of a tokamak reactor into which the fuel components are fed by various methods: tritium in the form of solid pellets and deuterium in the form of high-energy neutrals by means of an injector. The study was carried out with the use of a one-dimensional space-time plasma physics model describing the energy and particle balances in the tokamak plasma. The authors have determined the dependences of the reactor parameters (Q, βφ etc.) on the tritium fuelling rate.