<p>We report on terahertz (THz) wave parametric detection using a pulse train pump beam for remote sensing applications. While THz parametric detection is known as one of the highly sensitive detection methods for THz pulses, its requirement for temporal synchronization with the pump pulse has posed challenges for remote sensing. In this study, we constructed a detection system by converting the pump pulses into a pulse train, ensuring continuous detection even when the effective optical path length of the THz wave fluctuates. We evaluated the influence of pulse intervals and the allowable time window for temporal synchronization in parametric detection. By controlling the pulse interval of the pulse train pump beam, we achieved stable, uninterrupted detection even when the optical path length of the THz wave varied by approximately 180&#xa0;cm. Given its potential for detecting weak signals, this system is expected to serve as a promising THz detection solution for future remote sensing applications.</p>