[Purpose/significance]The spread of online public opinion in social media intensifies,gathers and explodes social contradictions,which generates a huge impact on social stability and public values.This paper aims to explore the evolution mode and law of public opinion by constructing the social network public opinion evolution map and analyzing the spatio-temporal data.[Method/process]Based on the knowledge graph theory,this paper takes the topic of“The launch of Tianhe core module”on Sina Weibo as an example and applies the technology of spa...