Based on the development of Lingshui 17-2 deepwater oil and gas field in the South China Sea, the OrcaFlex software is used to carry out the numerical simulation for the installation of the head end Pipeline End Termination (PLET) by J-lay installation, the influence of wave and current loads on the installation system is studied to obtain its operating window, and the influence factors of the operating window during the installation process of J-lay head end PLET are analyzed. The results show that PLET is more dangerous in the splash zone and the pre-landing process, and the control condition of the installation operation is when the wave period is about 10 s and the wave and current are in the same direction as the transverse wave. The research provides important technical support for the installation of J-lay head end PLET in Lingshui 17-2 submarine pipeline in the South China Sea.