The broadband nanosecond shaped laser pulse obtained by chirped pulse stacking(CPS) method can make the output stacking pulse meet the requirement of the inertial confinement fusion (ICF), and CPS is the main technique way adopted in front end systems in some laser facilities. However, temporal pulse shape modulation will exist due to the pulse coherence for chirped stacking pulse, and spectrum modulation will exist too. Moreover, the peak intensity of this stacked chirped pulses will change rapidly under different influence conditions. The evolutionary rules of the temporal pulse shape modulation, spectrum modulation and the intensity factor are reported. The results show the temporal pulse shape modulation is affected by the broadening factor and the delay time, as spectrum modulation is only affected by the delay time, and the intensity factor changes similarly with the cosine function of the phase factor.