The whole square measure of Taiwan is 360 million hectare, in which the mountain region accounts for 73.6%, and the level land accounts for 26.4%. Those past ambiguous policies, materialized developers, and unreasonable alternative laws make us lose the control over the developing of the hillside resources.

        Besides, because of the enormous change of the vegetation and terrain features, we can conclude one hideous truth that the natural environment system on the hillside has undergone the immense degree of injuring. Excessive utilizing the mountain slope makes the topsoil of it be exposed. Therefore, whenever we meet the torrential rain, there will be a large amount of soil losses, and the collapse phenomenon of the slope. In addition, it will as well cause downstream debris flows, and assault the brook’s ecological environment. The rate of betel nuts’ agricultural output value in Taiwan is pretty high. Especially, we can observe countless betel nut’s trees in the middle and southern part of mountain areas in Taiwan. It is one of their scenic characters, which is spectacular and staggering. The garden of betel nuts requires weeding too. However, this kind of garden is naturally unfavorable for water and soil conservation, especially those gardens which are built up along the mountain slope.

        The calamity which happens around the hillside will often be classified into the category of the “natural disaster,” since its causes are natural phenomenon of torrential rain, and earthquake… etc. In fact, from various kinds of hillsides’ developing analyses, we will clearly bring to a close that human’s relentlessly utilizing of our natural surroundings enlarges the scale and intensity of the natural disaster and calamity.