Chirped-amplitude-modulated (CAM) laser ghost imaging (GI) is a novel imaging mechanism that combines the principle of correlated imaging with pulse-compression. It can acquire the direction, grayscale, range and velocity of the target, and can effectively reduce the influence of the background noise on imaging quality. At present, the theoretical model and simulation verification of chirped-amplitude laser correlation imaging are preliminarily established. However, the influence of laser source modulation performance is not involved. For this reason, the influence of modulation performance on imaging quality of non-coherent heterodyne CAM GI is deduced and numerically analyzed. The relationships among initial modulation depth, modulation depth decay coefficient, frequency change ratio and bandwidth of photodiode on detection signal to noise ratio and imaging performance of heterodyne GI are obtained. This work has guiding significance for the future design and performance assessment of CAM GI lidar system.