Comparison of 2006 CMS HCAL Test Beam Data and GEANT4 Simulation

The 2006 test beam data of the combined CMS electromagnetic and hadron calorimeter modules is compared with GEANT4 simulation. Detailed comparison have been carried on linearity, e/h ratio, energy resolution and longitudinal shower profiles between the test beam data with electron and pion beams at different energies and GEANT4 simulation of the associated test beam geometry setup.