  In the overshoot mixing model with an exponentially decreasing diffusion
coefficient, the initial value of the diffusion coefficient plays a crucial
role. According to the turbulent convective mixing model, the characteristic
length of convection in the convection zone differs from that in the overshoot
region, resulting in a rapid decrease of the diffusion coefficient near the
convective boundary. To investigate this quick decrease, we conducted an
asteroseismic study on the intermediate-mass SPB star KIC 10526294. We
generated stellar models with varied input parameters, including the overshoot
parameters, and compared the resulting stellar oscillation periods with
observations. To mitigate the potential issue arising from large steps in the
stellar parameters and stellar age, we employed a comprehensive interpolation
scheme for the stellar oscillatory frequencies, considering all stellar
parameters and stellar age. Our analysis revealed that the quick decreasing of
the diffusion coefficient has discernible effects on the stellar oscillations
and a quick decrease with 4 magnitude orders shows the best oscillatory
frequencies compared with the observations. This provides weak evidence in
support of the prediction made by the turbulent convective mixing model.
Furthermore, we examined the residuals of the oscillation periods and
discovered a potential association between abundance anomalies in the buoyancy
frequency profile and the oscillation-like patterns observed in the residuals.
