Reduction of fuel economy and exhaust emission at spark ignition engines with direct injection can be achieved by investigation and optimization of mixture preparation and combustion process. In this paper principle strategies of mixture preparation and combustion are discussed. Phenomena of combustion like flame radiation, flame propagation and knocking combustion are represented for different mixture preparation strategies. For detection of combustion phenomena optical fiber technique as well as new visualization device with an endoscope have been used. From the view of present knowledge, obtained with investigation of spark ignition engines with direct injection, it is an important target for future development of GDI engine technology to force activities of combustion process investigation at different mixture preparation strategies.