Decay resistance and mechanical properties of heat treated Mongolian Scotch Pine,Dahurese Larch,and Beach Shore Pine solid wood samples were studied.Heat treatment temperatures ranged from 180 to 230 ℃ and the treatment duration ranged from 1 to 3 hours.The results indicated that higher temperature and longer time improved sample decay resistance.However,when compared to the untreated wood,the heat treated samples had increased mechanical properties at lower temperatures and then deteriorated under higher temperatures and prolonged duration.