Due to the usable frequency becomes more and more crowed,dynamic spectrum access (DSA) is a new hope to solve this problem.However,DSA in China requires a quantitative analysis of the current spectrum utilization in frequency,temporal and spatial domains.In order to free the precious spectrum,spectrum regulation organizations must have a clear,detailed,up-to-date understanding of where,how and by whom spectrum is currently being used—such data is essential to sound policy decisions in the context of cognitive radio (CR).In this paper,a concurrent spectrum occupancy measurement in south China was conducted to evaluate the practical spectrum occupancy with a digital wideband receiver covering from 20 MHz to 3 GHz.We also propose systemic spectrum measurement methodology,matrix format data storage,duty cycle (DC) evaluation metric and data mining process which can be a guideline for other researchers when they conduct the similar experiments.Quantitative analysis and characterization of the 4 different measurement locations are evaluated to promote the popularization of CR application in China.And a uniform Beta distribution channel occupancy model is also validated using real-scene measurement data.The experimental results demonstrate that there is a significant scope for license-exemption use of the released spectrum using CR technology.