Goos-Hnchen (GH) shifts of 633 nm polarized light through a μm-order isosceles triangle prism waveguide structure with Kretschmann-Raether configuration were simulated and analyzed. When the thickness of gold film is 45 nm, the maximum positive beam displacement, obtained using a Stationary-Phase Analysis (SPA), is about +120 μm at the incident angle of 44.1°; and it is +3.37 μm using COMSOL Multiphysics5.1 (CM) at the incident angle of 44.1°. The beam displacements, obtained using CM and SPA around the resonance angle, are all positive, although the enhancement effect from CM is much less than that of SPA. These results are useful for designing high sensitivity sensors based on GH shift measurement.