By using the methods of literature review, logical analysis, case analysis and other research methods,this paper analyzes the basic model, practical constraints and promotion strategies of Internet sports public welfare.The basic model of Internet sports public welfare is: “Internet plus+sports+public welfare” model; “Internetplus+Games+Public Welfare” mode; “Internet plus+Olympic champion+public welfare” mode. Realistic constraints:The multidimensional digital divide limits the audience; False information promotion reduces the user experienceof the audience; Information security issues affect audience participation in public welfare; Massive public welfareinformation leads to audience public welfare fatigue. Promotion strategy: shaping Internet sports public welfareculture; Create Internet sports public welfare projects; Reform the Internet sports public welfare mechanism.