At present, the research on the characteristics of ac/dc parallel transmission line radio interference is still in the initial stage. Based on the analysis of the disadvantages of the existing radio interference measurement mode, a real-time synchronous measurement system based on meteorological parameters and radio interference is established. Based on DBSCAN algorithm, the data of radio interference for one year are processed and analyzed. In order to analyze the correlation between radio interference and temperature, typical point data in DC region, AC-DC transition region and AC region are selected and analyzed by temperature segment. Through data analysis, the relationship between radio interference and temperature in each interval is obtained, which lays a foundation for the subsequent analysis of ac/dc parallel transmission lines.