Abstract: Neutron light output response is an important characteristic of the liquid scintillator. Accurate neutron light output response and the detection threshold can be used to determine the neutron detection efficiency. In recent years, a new highly integrated electronic module (MPD-4 of Mesytec Corp.) for liquid scintillator detector has been widely used in neutron detection system. The outputs of this module include the pulse height (PH) signal, the pulse shape discriminator (PSD) signal and the constant fraction discriminator (CFD) signal. Moreover, one NIM module can be used for four liquid scintillators at the same time. The neutron light output response obtained by the new kind of electronics was compared with that obtained by the traditional electronic system. According to the experimental results, the neutron light output responses of the two electronic systems have obvious differences. Therefore, it is necessary to measure the neutron light output response of the liquid scintillator if the MPD-4 modules are used in the neutron detection system.