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Homogeneous Charge Compression Ignition combustion in homogenized temperature fields was investigated experimentally using a super rapid compression machine. Temperature fields before a blue flame occurs are thought to control the burning process. The time of blue flame occurrence, burn rate and ignition delay time were measured. Temperature homogeneity before a blue flame occurred was controlled by two means. One was by the piston shape which controlled the roll-up vortex and the other was by the heat release of low temperature reactions that has a homogenizing effect. It was found that homogenized temperature fields contribute to the occurrence of a homogeneous blue flame while inhomogeneous fields produce an uneven occurrence.