An intelligent temperature control system according to period of time was presented to maximize saving the heating energy. The intelligent temperature control system with the microprocessor as the kernel is designed. The indoor temperature measurement used the DS18B20 temperature sensor and transferred to PC by RS485 communication bus

the temperature data and time setting displayed on LCD（ Liquid Crystal Display） monitor.When the indoor temperature is lower than the setting temperature value

the electric heater was automatically turned on

and the indoor temperature is high than the setting temperature value

the power of electric heater was turned off by controller. Comparing with traditional method

this temperature control system can set up multiple periods and different temperature

meanwhile

the time- varying algorithm of temperature control is adopted

the precision of temperature control is 1°C and meet the demand of heating energy saving.