The Yangtze River Delta fog and haze pollution is one of the main environmental problems facing the integration of regional development. To satisfy the demand of regional integration，the loose regional environmental management must transfer to regional collaborative governance，in which government，market and society are included. According to the release from the National Climate Center about 2013 national haze day numbers distribution，the Yangtze River Delta region is one of the country’s most polluted haze regions，and regional average annual concentration of PM2.5 is gradually decreasing from the northwest to the southeast，just coincided with the layout of the heavy industry of Yangtze River Delta. Industrial pollution and automobile exhaust are the main factors that produce the regional haze. However，in recent years，regional output of major industrial products and private car ownership are growing at a relatively high rate，which has negative effects on the haze governance. The Yangtze River Delta regional haze collaborative governance mechanism should be carried out earlier to support large-scale activities in the region. But it still faces many problems，such as the imbalance of regional development，uncoordinated main function division planning，local game and administrative barriers，loose cooperation mechanism，inconsistent regional environmental standards，as well as regional environmental services market is not unified problem. In order to promote regional integration and improve regional environmental quality，the Yangtze River Delta region should take collaborative governance mode. It is needed to formulate and implement the unified planning，the main function zoning is needed to create solid delta environmental protection cooperation mechanism，and regional unified energy distribution，the development of clean energy，the unified construction market environment service areas and the establishment of regional carbon trading system are also needed.