In order to understand the reason for the different photoresponses of a-As2Se3 depending on the exciting photon energy and to separate individual components contained in the photoresponse, the modulated photocurrent for chopped light is measured by varying the chopping frequency. However, the modulated photocurrent decreases almost monotonically against the chopping frequency. This means that the localized levels distribute quasi-continuously. From the consideration about the temperature dependence of the modulated photocurrent, it is confirmed that the components which cause the photoresponse to be different depending on the exciting photon energy are the carrier generation processes containing the thermal release processes.