Disclosed is a new Purley CPU radiator design method, comprising the following steps: acquiring a ventilation quantity of a scene, looking up a table to acquire a thermal resistance Rca value of a radiator; selecting a certain CPU model, looking up the table to acquire a power consumption value, and looking up the table to acquire the maximum surface temperature Tcmax value allowed by a CPU; using a product of the thermal resistance Rca value and the power consumption value of the radiator as a CPU surface temperature Tc value under the scene; comparing the CPU surface temperature Tc value with the maximum surface temperature Tcmax value allowed by the CPU; and if the CPU surface temperature Tc value is less than or equal to the maximum surface temperature Tcmax allowed by the CPU, confirming that the radiator can support the CPU model, and if the CPU surface temperature Tc value is greater than the maximum surface temperature Tcmax allowed by the CPU, needing to return to the aforementioned steps so as to reselect a low-specification CPU model. In the present invention, a CPU power consumption level that can be supported by the design of a radiator can be evaluated in advance through analysis, the efficiency is high, and the design cost can be reduced.
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