Abstract: Rapidly, accurate and non-destructive determination of the spatial and temporal distribution of soil moisture in farmlands and small-scaled basins is of immense importance in soil science, agronomy, ecological environmental studies and other related fields. As a new geophysical prospecting method, Ground-Penetrating Radar (GPR) is widely used in field studies. This paper analyzes the GPR application in soil moisture monitoring, focuses on the principle and approach of GPR soil water measurement, summarizes the progress of research in this field both at home and abroad, introduces common relationship between soil dielectric constant and soil water content, evaluates various GPR applications methods in farmlands, and advances problems and prospects of GPR with the view of providing a relevant scientific reference source.