This paper explores the green supply chain management (GSCM) of companies based in the Yangtze River Delta, China. The companies' overall GSCM practice level (L GSCM ) is measured by using the data from 165 valid respondents in a questionnaire survey conducted during April and May 2009. The relationships between L GSCM and the classified determinant factors are analyzed. It is indicated that Chinese companies are still at a preliminary stage of GSCM practices. Their environmental management in cooperation with external members of the supply chain is very marginal. A company's L GSCM is significantly and positively associated with the external pressures from regulatory, domestic clients and business competitors. As an internal factor, a company's learning capacity greatly determines L GSCM . We also confirm that the internal factors function as intermediate variables of external pressures in influencing a company's GSCM. A company's environmental management capacities will be strongly enhanced by frequent internal training of employees to increase its involvement in GSCM practices.