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Homogeneous Charge Compression Ignition (HCCI) combustion concept has potential of reducing NOx and PM emissions simultaneously and it is being considered as a future technology for diesel engines to meet tightened emission norms imposing by national governments. However, HCCI is limited to a narrow band of operating region due to difficulties in controlling combustion phasing close to Top Dead Center (TDC). From literature study, Exhaust Gas Recirculation (EGR), Intake Temperature, Boost Pressure, Equivalence Ratio and Compressions ratios are considered as most critical parameters for HCCI control. The chemical kinetics study was conducted to understand the HCC combustion using N-heptane mechanism with 162 species and 732 reactions. At lower equivalence ratio (lean burn combustion) higher CO and HC emissions were observed. The combustion efficiency was poor at lower temperatures, which resulted in high HC and CO emissions with less than 10ppm NOx.