Abstract: The authors discuss the concept，mechanism and afecting factors of bio-organic fertilizer，analyze the fertilizer eficiency mechanism and its applied effect of Chaoda bio-organic fertilizer and wondergrow high efficient organic fertilizer in crops，point out that the mechanism of bio-organic fertilizer is the coordination of microrganism ，high quality organic fertilizer and active materials produced in the fermentation processing，therefore，the fertilizer has good prospect in both organie food prod uction and safe food prod uction．