At present，most relative permeability curves are achieved at room temperature with inadequate representativeness. In order to know the flow mechanism during water flooding in the shallow super heavy oil reservoir，core displacement experiment was carried out to study the relative permeability curves of the water flooding in the shallow super heavy oil and threshold pressure gradient at different temperatures. The results show that the temperature has great influence on the threshold pressure gradient. The oil phase permeability curve and the water phase permeability curve are very different，and the oil phase descends rapidly and the water phase ascends slowly. With the increase of temperature，oil-water two phase relative permeability increases and the isotonic point moves to the right，and the relative permeability at the isotonic point increases gradually；the irreducible water saturation increases，and the residual oil saturation decreases. The oil displacement efficiency by steam flooding at the temperature of 140 and 180 ℃ is higher than that by water flooding，which are 10.6% and 11.9%，respectively. To a certain extent，it shows that the hot water flooding can increase the development efficiency of the super heavy oil reservoir.