Authors studied ana designed single nail-groove limb plate for reduction and fixation of lumbar spondyiohsthesis,First model of lumbar spondylolysis and spondylolisthesis was made in L3-S3 of six adult corpse. Ther reduction and fixation was Performed according to surgical technique of clinical I, on each plate there were six pieces of resistance straingage. Central and excentral load test as conducted, so as bend and torsion test. Lastly analysed of the data was carried with the help of computer type 586 and obtained linear equation and linear correlation coefficient. The plate was not loosened when central and excentral load amount to 900N, while bend and torsion reached 833N.cm and 666.4N.cm respectively stress of the stress point of plate increased linearly,which suggested that single nail-groove limb plate for reduction and fixation of lumbar spondylolisthesis had adequate biomechanical basis. Furthermore, the operation was simple, with adequate reduction and good stability.