  It is well known that the spin Hall effect of light (SHEL) can be easily
observed via weak measurement by the dark strip resulted from the splitting of
different polarization components. We find that the SHEL of partially coherent
beam (PCB) also has similar phenomenon. However, the existence of the dark
strip in the SHEL of PCB can not be properly justified by considering the beam
as a statistical assemble of coherent speckles. Also, the dark strip of PCB is
not purely dark. By analyzing the autocorrelation of the central dark strip
part of the SHEL of PCB, we show that SHEL of PCB is essentially the direct
result of overlapping coherent speckles' SHEL. Then we further prove our
conclusion by adjusting the converging level and the incident angle of the
beam. Finally, we develop a qualitative theory by taking the intensity
distribution of PCB into account, to fully clarify the SHEL of PCB. The
feasibility of our theory to Goos-H\"anchen (GH) scenario is also demonstrated.
