The compaction of the red beds filling material with repeating“crush-scarifying”process in site has the property of self-similar characteristics,therefor the particle characteristics of resulting crushed products could be described by fractal dimension.Based on the fractal mechanism of repeating crush process,the method using laboratory test equipment to imitate the crush process in site was created,then the variation law of fractal dimension on the red beds filling material produced by“crush-scarifying”process was studied.Then,the inflence of partical characters on compaction and hydrogical properties was studied on the filling material with different fractal dimention,which were prepared with the method.The results show that for filling material within the same compaction parameters,the bigger fractal dimension the materail is,the easier it could be compacted;within the same compaction of the filler,the bigger fractal dimension,〖JP2〗the fewer soaking expansion and the lower compression performance the material is.To a certain extent,this paper reveals the rule of the red beds road construction affected by the particle characteristics.