Abstract: Fracture water flow and heat transfer is an important influence factor on the behavior of high level radioactive waste repositories. The 3DEC discrete element software was used for analyzing an intact rock model without water flow and a fractured rock model with water flow. The influence characteristics of fracture water flow on the near field temperature distributions and evolutions were analyzed for a hypothetical high level radioactive waste repository. The calculations reveal that due to the endothermic effect of fracture water flow, the temperatures of the bentonite at the canisters surface obtained from the fractured rock model are lower than those from the intact rock model, and the time to reach steady state for the former is shorter; the temperatures of the bentonite at the canisters surface in the upstream are significantly lower than those in the downstream of the fractured rock model; under given conditions, the maximum temperature of the canisters surface bentonite for the fractured rock model is about 75% of that for the intact rock model, and when the fracture water velocity is increased from 0.2 mm/s to 0.5 mm/s, the peak temperature of bentonite at the canisters surface is reduced by about 4%.