Terrestrial heat flow is a key parameter in geothermal researches. Building upon the analyses of previously compiled terrestrial heat flow data, this paper examines the newly measured (260 sets), collected and screened (112 sets) data by authors since 2016. The added heat flow data effectively filled large data gaps in the southwest, northwest and northeast and improved the data density in the eastern region of China mainland. The proportion of high-quality data was improved to 86.3%. Using the latest data the calculated average terrestrial heat flow in China was 63.8 mW/m², higher than the national average value in the fourth compilation, with higher average values found for most of the primary and secondary tectonic units of China and lower values for the Qinghai-Tibet Plateau. The statistics of heat-flow data of typical geothermal systems showed that high average heat flow conditions could significantly improve the distribution range of conductive geothermal resources and the output temperature of hot springs, but were not a controlling factor for the formation of the two types of geothermal resources. Based on the latest terrestrial heat flow data and contour map of China related phenomena and problems were discussed, such as the increase of low heat flow area in the Qinghai-Tibet Plateau, the “overestimation” of early heat flow data in the North China Plain, and the existence of heat flow indicator magma sacs in the Changbai Mountain. It was noted that heat flow monitoring stations in China were still relatively few, and, with the continuous updating and standardization of the measurement methods, plus further improvements in data quantity/quality and sampling locations, the previously assessed regional heat flow characteristics might need to be re-examined. This study deepens the understanding of the status of terrestrial heat flow in China, and can provide better support for regional geothermal basic research and resource exploration.