The paper takes the real business-cycles theory as theoretical background,applies impulse response function and variance decomposition to analyze the transmission effects and contribution degree of supply elements of steel industrial to output,and studies the impact of supply shocks on the fluctuation of steel industrial output.

During the last 26 years, aggregate economic fluctuation is influenced not only by demand shock, but also by supply shock in China.

Theoretically, the supply shock, which is unanticipated change of supply in the short run, is an important factor to the alteration of general price level.

In the case of a demand shock,this paper argues that the effective demand will affect exchange rate uncertainly but the prices will affect it in a definitely way,by contraries,under a supply shock circumstances,the effective demand will affect exchange rate definitely but the prices will affect it in an uncertainly way.

And then, according to theory of international competitiveness, this paper makes a concrete analysis on China's timber industry safety from aspects of timber resource supply, demand quantity and quality, industrial organization competition, developm.

The education cause,which plays a decisive function in promoting social efficiency,also shoulders the glorious mission to advance social justice,which makes the efficiency and equity in public education resource supply a focused view.