An extensive air shower is generated when a highly energetic cosmic ray enters the atmosphere resulting in soft, hard, and nucleonic components, which a mini array can measure. These studies have been done by Stockholm Educational Air Shower Array (SEASA) located at Sweden, which have 3 detectors per station observing temperature dependence with count rate. Similarly, School Cosmic Rays Outreach Detector (SCROD) located at Boston used educational array of 3 detectors per station to study the G.Z. cutoff. A similar experiment is being set up at Dayalbagh Educational Institute (DEI), Agra in which a mini array consisting of 8 plastic scintillation detectors having dimensions (100 x 100 x 2) cm3 separated by 8 m at 171 m above sea level. This simulation involves the study of energy deposition of hadrons, γ and lighter leptons (μ+ , μ - , e - , e + ) in extensive air shower using CERN based open simulation toolkit GEANT4. The energy range of secondary particles is 0.05 GeV < Ep< Eγ< Ee -< Ee+< Eμ -< 7000 GeV, 40 GeV < Eπ± -< 7000 GeV. The aim is to observe real life physics and carry out future studies of EAS based on mini array.