Inertinite rich low rank coal has been found to be more reactive than vitrinite rich high rank coal. In the present investigation, reactivity assessment studies were conducted on two high ash, non-coking bituminous coals of Indian origin. The reactivity of the derived chars were also measured in kinetic regime-I by both non-isothermal and isothermal gravimetric analysis. The reactivities of the parent coals and the prepared chars were assessed from burning Profiles, crossing point/ignition point temperature measurement and calculated activation energies. A discussion is presented to Find the relationship between reactivity parameters and coal rank, maceral composition, char morphology and atomic H/C ratio of chars. The low temperature reactivity was found to have good relationship with coal rank and atomic H/C ratio of the chars.