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The dynamic line rating system can dynamically increase the transmission capability of transmission line, the asset utilization efficiency ratio and reliability of power supply. All of these meet the development requirements of smart grid. A dynamic line rating system based on measuring the tension of strain section is designed in the paper. Dynamic line rating (DLR) system can accurately calculate the average conductor temperature between strain section and the operating statys data of every span sag, assure power system safety while increasing the transmission rating. In this paper, the operating data sampled in a typical week are mainly analyzed. The result demonstrated that the tension and sag were stable and accurate, while taking the ambient temperature, wind speed and wind direction into account. Comparison was drawn between actual transmission line capacity and rated capacity. With the consideration of the margin, it is safe to increase the transmission capacity of power system by 20%-30% on average.