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Dynamic line rating is a technology that can be used to improve the transmission efficiency and capacity of the existing power system without changing the system structure or breaking the current technical specification. It is an economical and feasible method to meet the increasing power demands and the needs for new energy integration. In order to ensure the safe and stable operation of power system, the specific technologies and application methods affecting the reliability of DLR are discussed. The main limitations of data acquisition technology of transmission lines are analyzed, the advantages and disadvantages of different perception analysis methods are classified, several application architectures of the DLR system are compared, and some applications of current DLR technologies in actual engineering are discussed. The problems existed in the technologies of DLR are pointed out from four aspects: data acquisition, perception analysis, application architecture, and engineering practice, such as the quality of data acquisition is low, the dependence of perceptual analysis on parameters and the data collected is high, the application architecture is open-loop, the analysis on the overall security of the power grid is deficient. Finally, the future research direction is pointed out.