At　present,　there　is　a　consensus　that　the　digital　economy　provides　a　new　impetus　for　sustainable　economic　development.　Based　on　domestic　and　foreign　literature　reviews,　this　paper　focuses　on　representative　industry　sectors;　we　present　China＇s　2011-2018　digital　economy　development　index,　for　173　cities,　from　a　three-level　perspective-internet　development,　digital　literacy,　and　industrial　efficiency　improvement.　Various　models,　such　as　the　instrumental　variable　method,　the　double　difference　method,　the　intermediary　effect　model,　and　the　spatial　econometric　model　were　used　to　quantitatively　analyze　the　impact　of　digital　economic　development　on　urban　economic　growth　in　China.　The　study　finds　that:　(1)　digital　economic　development　in　China　has　a　positive　effect　on　urban　economic　growth,　and　a　heterogeneity　of　effects　exists　between　different　cities.　(2)　Urban　employment　is　the　＂effect　mechanism＂　of　digital　economic　growth　on　urban　economic　growth.　(3)　The　direct　effect　of　digital　economic　development　on　urban　economic　growth　in　China　is　positive,　the　spillover　effect　is　positive,　the　direct　effect　is　greater　than　the　spillover　effect,　and　the　total　effect　is　positive.　The　research　results　enrich　the　measurement　methods　used　in　urban　digital　economic　development　in　China,　providing　new　perspectives　for　studying　the　influence　mechanisms　of　digital　economic　development　on　urban　economic　growth.