Since the last coffee crisis of early 2000s, development of specialty coffee, and especially eco-friendly labelled coffee, has been raising rapidly. Although effect on producers and global relationship has been documented, the dynamic of certification adoption and its comprehensive effects on coffee sectors in producing countries are still poorly documented. The poster presents a comparative study of the dynamic of development of Eco-labels in two high quality Arabica coffee producing countries, Costa Rica and Kenya. Using available secondary data and original data's derives from stakeholders comprehensive interviews, we show that the different pace and magnitude of the adoption of the certification schemes between this two countries depended on pre-existing institutional environment, governance and balance of power in the commodity chain and that the development of certification schemes tended to modify both structure and functioning of the commodity chains and contribute to gradual evolution of balance of power.