We present a quantitative evaluation study of the thermal effect responsible for laser-triggered collective magnetization dynamics in a ferromagnetic(Ga,Mn)As film without applying the external magnetic field by employing the pump-probe magneto-optical spectroscopy.Our observation shows that the effect of ultrafast laser heating on the manipulation of magnetization precession in a(Ga,Mn)As film is not exactly equivalent to that of the ambient temperature increase,and needs to be carefully analyzed by considering the temperature-dependent specific heat of(Ga,Mn)As.The transient modulation of magnetocrystalline anisotropy via ultrafast laser heating at low temperature exhibits a higher sensitivity than that at high temperature.The quantitative analysis of the laser-heating manipulated magnetization precession presented in this work is helpful for evaluating the laser-triggered ultrafast magnetization dynamics in(Ga,Mn)As films. We present a quantitative evaluation of the thermal effect responsible for laser-triggered collective magnetization dynamics in a ferromagnetic (Ga, Mn) As film without applying the external magnetic field by employing the pump-probe magneto-optical spectroscopy. Our observation shows the the effect of ultrafast laser heating on the manipulation of magnetization precession in a (Ga, Mn) As film is not exactly equivalent to that of the ambient temperature increase, and needs to be carefully analyzed by considering the temperature-dependent specific heat of (Ga, Mn) As.The transient modulation of magnetocrystalline anisotropy via ultrafast laser heating at low temperature exhibits a higher sensitivity than that at high temperature. The quantitative analysis of the laser-heating manipulated magnetization precession presented in this work is helpful for evaluating the laser-triggered ultrafast magnetization dynamics in (Ga, Mn) As films.