Shock-wave/boundary-layer interactions (SWBLI) on concave walls dominate the flow properties in the inward-turning inlet. To reveal the effects of concave wall curvatures on the SWBLI, interactions between an incident shock (IS) and turbulent boundary layers on half- elliptical surfaces with different aspect ratios (AR) are investigated using the planar laser scattering method and numerical simulations at a nominal freestream Mach number of 6. The sweeping and impinging of IS on the concave wall cause complicated SWBLI. As the IS sweeping the sidewall, the interactions between IS and the separation shock on the sidewall transit from Mach reflection (MR) to regular reflection (RR). When the IS approaches the bottom of the concave wall, the reflection of IS couples with the upstream sweeping flow, which induces a large separation with a streamwise counter-rotating vortex pair near the symmetry plane. Both the location of MR-RR transition and the separation length change with the increase of AR, indicating that the concave wall curvature plays a crucial role.