Abstract: To study the effect and mechanism of the light quality acting on Tremella fuciformis,and provide a theoretical basis of Tremella fuciformis primordium( TFP) formation and for growth and development of Tremella fuciformis Berkeley( TFB),TFP formation time,the rate of turning into mushroom,total biological effect and product property of Tremella fuciformis under different light-emitting diode( LED) condition were investigated in this research,in order to offer the reliable theoretical foundation to the industrialization of Tremella fuciformis.The results showed that under the white LED treatment,TFP formed the earliest,the rate of turning into mushroom were better( up to 94.67%),which was in the light source powers of 8W and light illumination time of 8 h/d; TFB growth rate in the white light illumination conditions was better than the natural view,red,green,yellow and other different light qualities,and the TFB diameter was the largest,which was up to 13.24 cm after cultured 21 d.There were different effects on TFB product quality for different light qualities.The weight of single sample was the highest in the white light illumination conditions.The content of Tremella fuciformis polysaccharide was the highest in natural light and white light processing conditions. The content of Tremella fuciformis protein was the highest in yellow light. The content of ash was the highest in yellow light processing conditions but showed no significant difference with natural light,white light and green light( p > 0.05). The total biological effects were the highest in natural light and white light processing conditions.The optimal light conditions for TFB growth and development were 8 W LED white light,while the time of shining was 4 h every day and the intensity of illumination was 713 Lux. Under these conditions,the total biological efficiencies of TFB were 37.7% + 1.04%,and the contents of polysaccharide were24.5% + 1.75%.