The United States PT3505 oven, for example, the use of the method steps are as follows. First of all, you need to safely connect the oven's power supply; and then the oven empty box preheating, according to the baking requirements of the thermostat will be adjusted to the desired temperature, and will be adjusted to the heating time of about 5 minutes, preheating is complete, and then put the food into the oven; and finally set up the specific temperature and baking time, the oven can begin to bake the food. The use of other brands of ovens is also basically the same, all need to be preheated before use.