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VCC (variable combustion chamber) piston technology would be one of the best substitutes for VCR (variable compression ratio) technology due to its extremely fast dynamic response with simple structure. One of the key issues of VCC piston technology is its dynamic response, which means fast, timely and enough variation of the combustion chamber volume during combustion in each working cycle while excess in-cylinder pressure occurs. Two key design features, ball-profiles and a reset cam, are introduced in order to ensure the availability of transient dynamic characteristics of VCC piston. Several formulas are derived from the structural analysis on VCC piston to describe the relationship between VCC piston design and its dynamic characteristics.