In order to understand the percolation mechanism and development regulation in low-permeability buried-hill fractured heavy oil reservoir，similarity criteria of physical simulation on water flooding and hot water flooding in the fractured reservoirs was established by using similarity theory and flow theory. Taking a low-permeability buried-hill fractured heavy oil reservoir in Bohai Sea as an example，a large scale physical model（1 m×1 m×0.5 m），as analogy of the objective reservoir，was designed to simulate the water flooding experiment in different well patterns and development modes. Analysis results on oil production，water production and water-oil saturation in experiment show that：the stereoscopic horizontal well pattern can give full play to the function of oil-water gravitational differentiation and reduce the rising rate of water cut in the buried-hill reservoir. The staggered well pattern can increase the sweep efficiency of the injected water by increasing the injector-producer distance. Effect of the hot water flooding becomes worse as the injector-producer distance increases.The addition of surfactants into the injected water can increase the oil displacement efficiency in the fracture and lower the imbibition effect and matrix contribution rate.