Based on the CGSS2005 data,a multi-level model is established to analyze the social factors which influence residents’ sense of happiness.Researches show that such social factors having the significant influence on residents’ sense of happiness as income,housing property,human interaction,polarization between the rich and the poor,democracy participation,governmental service,social security,conflicts and disputes,etc.Based on this,this paper proposes countermeasures and suggestions to enhance residents’ happiness level.