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For the requirement of synchronous control of multiple heater in many industrial facilities, a design of multiple channel temperature controller based on ARM processor is introduced. Signals of temperature sensor from each channel are selected separately by analog switch and sent to instrumentation amplifier AD620. Amplified signals are transferred by AD chip AD7705 to digital signals which can be proceeded by ARM processor LPC2132. Combining the desired temperature, the output control variable which is obtained by using integral separated PID algorithm, is introduced to adjusting the duty ratio of powering time for heater. Results of the trail indicated that the consistency of temperature measurement and control performance can be promoted obviously.