A carton with a polyethylene bag lining was used as a culture vessel for sweet gum veneer feeder strips.Soil,water,feeder strips,and specimens were sterilized and added to the culture bag for a decay test.Variance of analysis results by Statistical Analysis System（SAS）showed that the effect of fungi species and exposure periods on the weight loss and strength loss of wood decay was significant（at 0.05 level）,and the relationship between weight loss and strength loss due to biological decay were also very significant.The results suggested that the experimental method designed by the authors was a feasible way to assess wood decay.