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Spark induced compression ignition (SICI) is a practical control technology for ignition enhancement in gasoline HCCI combustion. In this paper, SICI combustion mechanism was studied using combustion visualization, engine test and numerical simulation respectively. It provided a useful combustion optimization guide for gasoline HCCI engines. Firstly, the ignition process of SICI was captured by combustion visualization in an optical engine. The results show that SICI is a combined combustion mode with partly flame propagation and main auto-ignition. The spark ignites the local mixture near the spark electrodes and flame propagation occurs before the homogeneous mixture auto-ignition. Heat release from the burned zone due to flame propagation which increases the in-cylinder pressure and temperature, and causes the entire mixture auto-ignition.