The improvement process of wood energy systems in palm sugar industry on Sathing Phra Peninsula is a successful example of the development oriented research on agrarian system process incorperating a preliminary phase of precise and accurate dianosis, on-farm research methodlogies and good links between research and extension works. This paper describes the mojor constaints to adopting the two pan stove drawn from the evaluation phase of the past innovation, and the reorientation of research and extension activities to overcome the problems which were reported. The one-open pan stove with a chimney and grate and its transportable metallic knock down mould were designed and tested in close cooperation with the two-pan stove were repeated with the new stoves. Monotoring of adoption of the innovation in the local conditions of production after a one year period of successful extension in 1990 is presented.