Abstract: When supercritical water flows in parallel heating channels, it is unavoidable that there will be some differences in the flow between pipelines due to the influence of pipe size and other parameters. If the difference is large, it will make the difference of flow between pipes very obvious. Through the simulation study of the supercritical water flow in parallel channels, the variation of flow difference between pipes is obtained when the heating power between channels is asymmetric. The results show that after the exit reaches the pseudo-critical point, the thermal resistance effect is more obvious; when the inlet temperature is higher and the inlet velocity is lower, the phenomenon of flow obstruction in the hot pipe and the flow rate in the pipe transferring to the cooler pipe is more likely to occur; when the system pressure is lower. The flow redistribution phenomenon is more likely to occur. Through the simulation study of asymmetric heating between parallel channels, the mechanism characteristics of asymmetric heating affecting flow redistribution can be deeply understood.