We have developed a novel method for retrieving the single-point lower ionospheric density profile, utilizing observations from Loran-C and a ray-theory-based Earth-Ionosphere WaveGuide (RT-EIWG) model. Compared to other signals probing the D layer, such as VLF transmitters which provide path-averaged information on the upper boundary, and lightning sferics, which are less stable and dependent on the unpredictable occurrence of lightning, Loran-C offers significant advantages. The reflections of the Loran-C signal are clearly resolved over distances of 300-600 km. Additionally, the 1-hop reflection does not overlap with subsequent hops, and the signal is consistently emitted along a fixed path (interval ranges from 40 to 100 milliseconds). The RT-EIWG model effectively simulates ionospheric reflections at distances less than 1000 km. By combining the RT-EIWG model with Loran-C observations, we have established a new method for determining the electron density profiles of the D layer. Initial results indicate that the nighttime lower ionosphere varies with a period of a few minutes consistently. The method would be a powerful tool for the research of lower ionosphere interaction in the future.