Landslides, as a common geological hazard, often occur with enormous destructive power and loss of life and property. Non explicit landslides are difficult to detect and warn of in a timely manner due to their lack of deformation signs and landslide terrain features. Therefore, detecting potential landslide risks in advance through non-contact detection methods is of great significance for preventing geological disasters. The semi aerial transient electromagnetic method has advantages over other geophysical exploration methods in terms of detection depth, detection efficiency, resolution, and applicability to complex terrain. It has shown great potential in the detection of non explicit hidden slope bodies. However, existing research and applications have not clearly defined the effects of different terrain conditions, differences in landslide structures, and different emission observation parameters on the semi airborne transient electromagnetic detection capability. Therefore, we conducted forward numerical simulations based on a typical non explicit landslide model and analyzed the semi airborne electromagnetic response characteristics of non explicit landslides. Firstly, three typical three-dimensional geoelectric models of non explicit landslides were constructed. Then, finite element simulations were used to obtain semi aerial transient electromagnetic responses under different device parameters. Furthermore, the response characteristics were analyzed and summarized based on measured data. The final location of the source will have a significant impact on the detection results, and the source should be placed on a gentle and sloping terrain during detection; And when there is a sudden change in the electrical interface underground, the forward modeling results will undergo a sign change phenomenon, which can point to the boundary of the landslide. The experimental results show that the forward calculation results are reliable, and the conclusions obtained can lay the foundation for the application of semi aerial transient electromagnetic method in landslide detection in the future.