Abstract: By discussing the mechanism of turbulence plasma scattering electromagnetic wave in hypersonic reentry wake, the first order distorted wave Born approximation model about the radar cross section is derived from the underdense turbulence plasma for engineering application. Applicability to fully-developed turbulence wake plasma field is analyzed, the program about 3-D wake plasma is improved and compiled. Based on the flow field parameters about the turbulent wake and this scattering model, the effects of reentry wake turbulent plasma is analyzed on the radar cross section. Several representative factors chosen to examine are turbulence modeling, turbulent transition course, turbulent scale and the initial condition for the fluctuation intensity of electron concentration. The conclusions drawn is that turbulent transition course and scale are not too important, the initial condition for fluctuation intensity of electron concentration is very important, and turbulence modeling plays a little role under the specific conditions.