The meaning of green competitiveness of enterprises is the competitiveness based on the greening.The petrochemical and chemical industry provides energy sources and resources for the other industry.But it consumes large numbers of resources.And it is also a heavy pollution industry.So it's very important to analyze the status of enterprises' green competitiveness of petrochemical and chemical industry.The paper uses the data of listed companies of petrochemical and chemical industry in the Yangtze River Delta to evaluate their green competitiveness,applying the DEA approach.The empirical results showed that the enterprise' s green competitiveness of petrochemical and chemical industry in the Yangtze River Delta needed to improve.And the results also suggest the direction of how to improve.At last,we offer some material measure for enterprises of petrochemical and chemical industry.