Abstract: The result for analysing the relationship and structure between the forestry scientific and technological progress (FSTP) and forestry resources increase andeconomic crisis decrease finds that there are two kinds of means to increase forestresources by FSTP. One is by recovering forest resources, and the other is by decreasing forest resources consumption. The study also shows that "development","utilization", "conservation" and "storage" are four kinds of activities in FSTPctivities for forest resources increment. The system dynamical model hasbeen established according to the opinions metioned above, and the conclusionof model analysis points out that the effectiveness of FSTP is obvious whichis indicated by four index value of scientech level coefficiency, contributionto forest resources, investment return rate and benefit evaluation. Of which,the effectiveness of resources increase by refforestation way is much more obvious than resources increase by consumpationcontrol way. Among differentFSP activities, the effectiveness of conservation behaviour is the first, whilethat of development is the second, and utilization is the third.

Key words: Scientific and technological progress, Forest resources increment, Effectiveness analysis, Forestry