In recent years heating of fusion plasma by Bernstein waves in spherical tokamaks has been considered. Electromagentic waves in spherical tokamaks are unable access to the plasma center due to existence of high density . This limitation has been resolved by coupling of extraordinary mode power to Bernstein wave via mode conversion in upper hybrid resonance layer. The EBW is a quasi-electrostatic wave that can be excited by mode conversion from a suitably launched O or X-mode its propagation further inside the plasma is strongly influenced by plasma parameter. The key issue in mode conversion is calculating of mode conversion coefficient that is so sensitive to density. This sensitivity has been showed in Buden parameter (?) and density scale length. By calculate for T and NSTX tokamaks in plasma center, optimized mode conversion in condition that electromagnetic wave injected from inner side of tours were obtained. In second part of this research , with using of The Lower hybrid Simulation Code LSC, profiles of electron density and electron temperature for T and NSTX were obtained and survived . In this work, we investigated lower hybrid wave interaction in the T reactor and found an optimal lower hybrid wave power and frequency for it. Finally, we compared the lower optimal hybrid waves and T spherical tokamak with NSTX tokamak . Finally using of electron distributions recived from LSC code and Vlasov-Maxwell equation fusion reaction rate was calculated. For T more power in compared with NSTX was obtained. Density achieved from Vlasov-Maxwell equation have extreme fluctuation related to time and space so we saw extreme fluctuation in recived interaction power.