Users and traffics of mobile communication is growing rapidly along with the application of 5G，but pilot resources are still restricted to limited ranges，which leads to the scarcity of pilots in cellular mobile communications. Under the urgent requirement of higher efficiency on pilot utilisation，a small-scale method based on the classical large-scale strategy is proposed. This method divides a cell into several regions in shape of rings，and diversifies the reuse factor to multiple values in a cell. Every user is allocated to a specified reuse factor according to its attached ring. To decrease the effect of interference，users near the edge of a cell have smaller reuse factors than those in the central region，whose higher degrees of reuse save the occupancy of pilot resources. Although the distribution of small-scale strategy is more complex than that of large-scale way，it has better performance on balancing the communication quality and pilot consumptions in a system. Meanwhile，it offers more precise adjustments on the extent of reuse. The simulation results verify the improvement on pilot reuse，utilising distinct factors and adjusting coverages of rings adaptively according to the number of terminals. Influences of some system configurations and extrinsic factors obtained from the simulation provide references for the implementations of small-scale reuses.