Tsunami run-up wave has been hypothesized as non-Newtonian fluid due to the presence of sediment and debris in its body. This paper asscesses the rheology of run-up wave based on the established flow and viscosity curves. Soil sampling was conducted at shoreline of Kuala Teriang and Kota Kuala Muda, Kedah, Malaysia. Investigation on the geologic layers at four diffeent trenches i.e. two from each sites showed that positive indication of tsunami deposits exist at Kuala Teriang. Observation at Kota Kuala Muda was rather challenging due to factors such non-discrepant grain size and sediment type between native and tsunami deposits, indequate post sedimentation to preserve the tsunami soil, and weathering effect Rhelogy experiment conducted used four diffeent mixtures with varying volumetric concetration of tsunami fine sediment i.e. 10, 20, 30 and 40%. Results showed that all mixture exhibit non-Newtonian Bingham pseudoplastic behavior with threshold limit ranging from 0.0328 to 131.2 Pa.