The invention discloses a control method of a wearable device. A method includes the following steps of receiving a voice signal of a user; sending the voice signal to a cloud server, so that the cloud server recognizes a voice signal to obtain a control instruction; receiving a control instruction sent by the cloud server; sending the control instruction to a household electrical appliance through a short-distance wireless communication means, so that the household electrical appliance executes the corresponding action according to the control instruction. According to the method in the embodiment, the applicability of the household electrical appliance is improved by voice control on the household electrical appliance through the wearable device, so as to make the user more convenient touse, lower the cost, and ensures simple and easy implement. The invention also discloses a wearable device and a control system of a household electrical appliance with the wearable device.