Since　the　reform　and　opening　up,　the　urbanization　level　of　urban　agglomerations　in　China　has　improved　significantly,　but　there　are　obvious　regional　differences　between　urban　agglomerations.　It　is　very　important　for　urban　construction　to　study　the　interaction　between　transportation　infrastructure　and　urbanization.　This　paper　selects　the　panel　data　of　Beijing　Tianjin　Hebei　Urban　Agglomeration,　the　middle　and　lower　reaches　of　the　Yangtze　River　urban　agglomeration　and　Chengdu　Chongqing　urban　agglomeration　from　2009　to　2016,　constructs　the　panel　vector　autoregressive　model,　and　discusses　the　interaction　between　the　transportation　infrastructure　and　urbanization　of　the　three　urban　agglomerations.　The　results　show　that　there　is　a　significant　one-way　relationship　between　the　traffic　infrastructure　and　the　urbanization　level　of　the　three　urban　agglomerations;　the　traffic　infrastructure　construction　speed　of　Beijing　Tianjin　Hebei　Urban　Agglomerations　and　the　middle　and　lower　reaches　of　the　Yangtze　River　urban　agglomerations　is　slow,　which　slows　down　the　urbanization　speed　of　the　two　urban　agglomerations,　while　the　traffic　infrastructure　construction　of　Chengdu　Chongqing　urban　agglomerations　promotes　the　urbanization　level.　Based　on　the　research　results,　the　paper　puts　forward　targeted　policy　recommendations　to　promote　the　coordinated　development　of　transportation　infrastructure　construction　and　urbanization　in　three　major　urban　agglomerations.　©　2022　SPIE