The environmental quality problems of construction engineering are endangering the existence and sustainable development of human beings, so their treatment is becoming common understanding of all levels of governments and the public. In this paper, the forming course and affecting factors of environmental quality and main symptoms of its problems are analyzed from the definition of environmental quality in construction engineering. Then, the essence of the problem is revealed, that is comprehensive abilities for quality activities and their results can't meet the regulated requirements. Finally, it expounds five basic characteristics of the problems to enhance people's understanding.