Mathematical analysis can be applied to elucidate dynamic steady state in temperature modulated DSC, because it is a linear process, and its results were reported previously, but it was done on assumption of constant heat capacity. In real measurement the heat capacity is not constant instead it is dependent on the temperature. To elucidate thermal response during heat capacity change, computer simulation has been applied. Two cases have been simulated : heat capacity with linear temperature dependence and ramp change of heat capacity like a glass transition. The results are reported in this paper in relation to additional errors due to this temperature dependence.