The invention discloses a method for enabling a temperature control load to participate in the frequency regulation of a power system. The method comprises installing a controller in the temperature control load, detecting a system frequency fnow through the controller, and when the controller detects that a system frequency deviation exceeds a limit, according to a steady frequency predicted value fpred, taking different control measures and changing the power demand of the load to cooperate with the active power regulation of a power grid. The method can realize power balance quickly by directly removing the load in the case of a large power shortage, and can adjust the load setting temperature in the case of a small power shortage to gradually restore the rated frequency of the system,does not generate under-regulation and over-regulation, and has high control reliability and a good effect.