Since this kind of oven cannot ferment, the optimal fermentation temperature is 30~40°. Generally, yeast will die at temperatures higher than 38°C, so it is best to adjust the temperature to 37°C. Or use automatic mode. The new Changdi fermentation function has automatic temperature control and can be adjusted automatically when set. But if it is an old Changdi electric oven, it is difficult to control the temperature; generally it cannot be controlled within this range.