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目的：探讨改良式逐步后退法在前牙根管预备中的应用的效果方法：选取门诊病例60例，随机分为3组，每组20例A组为冠向预备方法，B组为改良式逐步后退法，C组为逐步后退法，来预备根管，比较A组和B组的根备时间：比较A、B、C组的根备术后反应（EIEA）结果：A，B组根备时间相似，无统计学差异，在EIEA上，A、B分别和C组比较均有统计学差异。结论：改良逐步后退法在前牙根备上是个简单易行，不仅根备快，而且术后反应小的方法，值得推广。“,”Objective: To investigate the effect of application of improved the step- back technique in root canal preparation on the anterior teeth Method : 60 cases, were randomlydivided into 3 groups, each group of 20 cases of selection .A group for the crown-down preparation method, group B was the improved step- back technique, group C as the step -back technique, prepare the root canal. comparison between A group and B group of root canal preparation time: comparison of A, B, C group of root canal preparationof the postoperative reaction (EIEA) RResults:: the A, B group of root canal preparation time similar, no significant difference .In EIEA, A, B and C respectively, the difference had statistical group comparison. Conclusion: the improved step- back technique in anterior teeth root preparation is a simple and easy method, not only fast but also small postoperative reaction .It is worth promoting.