Abstract: The effects of the time and power of microwave treatment on the properties of quick-frozen Yu-Shiang shredded beef,including sensory quality,shear force,product yield and water content,were studied in this paper. The samples were treated at 30,45,60,75,90 s and 480,560,640,720,800 W respectively. The results showed that the microwave re-heating parameters for quick-frozen Yu-Shiang shredded beef were 45 s and 640 W in which the dishes products showed the best quality characteristics,sensory scoring 89,shear force 9.125 N,product yield 94.29% and water content 39%. With the optimum microwave power and time,the quick-frozen Yu-Shiang shredded beef was tender and juicy,waxy with good color and rich fragrance.