In this work particle induced reaction on Aluminium (27Al) and Gold(197Au) in di erentrnenergy range have been studied. Excitation function for the reaction chanells of the typern27rn13Al( ,n)30rn15P, 27rn13Al( ,2p)29rn13Al, 27rn13Al( ,n+2p)28rn13Al, 27rn13Al ( , +n)26rn13Al; 197rn79 Au( ,n)200rn81 Tl,rn197rn79 Au( ,2p)199rn79 Au, 197rn79 Au( ,n+2p)198rn79 Au and 197rn79 Au ( , +n) 196rn79 Au were studied andrncomparative analyses were made for analogus reaction channels of both the light 27Alrnand heavy 197Au target nuclie. The experimentally measured excitation functions ob-rntained from EXFOR data source, IAEA, have been compared with the theoretical calcu-rnlations with and without the inclusion of pre-equlibrium emission of particles, made byrnCOMPLET code. Level density parameter is varied to get good agreement between therncalculated and measured data with minimum e ort on parameter tting. In the studyrndi erent reaction nature were observed between the heavy and light nuclides while beingrnbombarded by the projectile of particle having the same energy range