The slab track models with proportion of 1∶5 were built. The vibration characters of the slab and concrete bed in structure with different packing materials were studied by the hammer vibration exciting. Results show that when the bag pouring method is used, the vibration acceleration of the slab of CA 3 type mortar is much higher than that of the other 3 types. And the vibration acceleration of the concrete bed of it is much higher than that of the other 3 types. The vibration acceleration of the concrete bed of the SL 1 type mortar is the biggest, and its continuing time is the longest. When the model pouring method is used, the vibration acceleration of the slab of CA 2 type mortar is much higher than that of the other types. And the vibration acceleration of the concrete bed of the CA 1 type mortar is higher than that of the other types. Just considering the vibration acceleration of the slab and the concrete bed, the CRTS(China railway track system) Ⅰ type using bag pouring method and CRTSⅢ type using model pouring method are the optimized track structure.