Investigating the dependence of reactor core neutronic parameters on the accelerator related parameters such as source multiplication coefficient ( K s ), beam profile and electron beam energy ( E e ), have a significant impact on the design of future ADS reactors and the cost of their construction. Using the MCNPX code, core neutronic parameters were calculated for three eigenvalues levels ( k s ) such as axial and radial distributions of neutron flux, effective multiplication coefficient ( K eff ), photoneutron yield ( Y n / e ), net neutron multiplication ( M ), energy gain ( G ), energy constant gain ( G 0 ), power peaking factor ( P max / P ave ), and importance of neutron source ( φ *) for the tungsten target in the core of TRIGA reactor which was driven by an electron accelerator. According to the results, when K s increases safety margin and the required accelerator current ( I e ) decrease, but the parameters G and φ * increase. Also, using the parabolic spatial distribution for the electron source instead of the uniform spatial distribution, the parameters Y n / e , G and M increase. In addition, by increasing E e from 100 to 500 MeV, Y n / e and G are improved, and I e and accelerating power ( p acc ) decrease. Therefore, these results suggest that the dependence of reactor core neutronic parameters on accelerator related parameters is necessary to optimize the design cost of an ADS reactor.