The results show that investment of PTF increases the GDP more than the investment of PTF, large quantity of tax and profit, a lot of opportunity of employment.

• 但是，在实践过程中对许多问题仍缺乏具体和定量的分析，影响着环境与经济协调发展的科学决策，如污染治理对国民经济的定量影响就是其中之一。