The paper analyzed the characteristics of temperature inversion and the impact of temperature inversion on PM2.5 mass concentration in Jinan from 2008 to 2017 based on L-band radar data, temperature profiler data, micro-pulse laser radar data, PM2.5 mass concentration data and conventional meteorological observation data. The frequency of temperature inversion was 47.2%, and it showed a decreasing trend year by year, with an annual decline rate of 0.44%. In general, the frequency of temperature inversion, temperature inversion intensity and thickness were higher in winter and lower in summer, but seasonal variations of different inversion types were different. The mean thickness of ground inversion was 134 m, and the intensity of ground inversion was 2.46°C·(100 m)-1. The thickness of suspension inversion was 212 m, and the intensity of that was 1.34°C·(100 m)-1. Temperature inversion was one of the important factor affecting air quality. The occurrence of temperature inversion led to a 24.8% increase in PM2.5 mass concentration in Jinan. PM2.5 mass concentration was significantly and positively correlated with the thickness of temperature inversion, while the correlation between PM2.5 mass concentration and the intensity of temperature inversion did not pass the significance test.