Forest in Thailand was some 70% of our country area but declined to 50% in 1960 s. Thirty years later,in 1990 our forest was in crisis, the most important forest biodiversity and ecosystem function declined to 15%. Lots of Thai people convert our forests into money,not for moral,social or environment reasons,but for their market reasons. Moreover, people cut down trees to use the wood for building and they use the land for farming and grazing.