In the view of modern synthesized evolutionism, this paper analyses and considers the different indirection, essence and stability in bio-evolution under natural, artificial and polluted environment.

• 本文依据现代综合进化论的观点分析认为,由于选择因素的不同,在自然条件下、人工条件下以及污染条件下,生物进化的方向、性质及其稳定性也各不相同。