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In view of the fact that there is no effective means to measure engine piston temperature, this paper designed one feasible embedded piston-temperature testing system. By selecting K–type thermocouple as temperature sensor and combining AD590 with output compensation voltage of one 2.5V reference voltage source, it further compensated thermocouple cold-end temperature accordingly. In addition, it adjusted AD8495 set-point voltage under present temperature to output rising edge for achieving function of adjustable trigger temperature. After collecting temperature data upon 3 test points on top of piston via embedded Analog-to-digital converter (ADC) under control of PIC single chip, it turns out this system can send all test results to receiving platform of upper computer via CC2530. Before test, the entire system was also calibrated within high-temperature cabinet. After completing a series of comparisons between actually-tested values and calibrated ones, subsequent tests upon engine bench would be conducted. And these actually-tested results show that test accuracy of the system can reach ±1℃. It can normally operate even in high temperature environment up to 130℃, demonstrating better stability and reliability.