In order to provide a basis for cost-benefit assessment to government sectors in investing in accessible environment construction, which was conducive to the accurate implementation of policies, the economic value of accessible environment was quantitatively measured from an economic perspective, the relationship between accessibility and high-quality economic development was expounded, and the mechanism of accessible environment driving economy was clarified. In general, accessible environment could make the disabled groups work and live better, increase the employment rate of the disabled, prolong the effective working life of the elderly, increase the labor supply, increase the economic growth and expand the economic aggregate. In terms of economic growth, this paper set up two control groups, namely, China′s economy under real population conditions vs. the economy in which the effective working life was extended by 5 years in a perfect accessible environment. The Cobb-Douglas production function was used to compare the differences in economic growth between two groups. The results show that under a perfect accessible environment, China′s economy will grow at a long-term acceleration of 0.19%, which is equivalent to an annual increase of 188.3 billion CNY in GDP(Gross Domestic Product) at this stage. In terms of economic aggregate, this paper assumes that perfect accessibility can make disabled people have the same employment rate as healthy people, so as to calculate the economic value created by disabled people. The results show that China′s GDP will increase by 498.43 billion CNY annually, accounting for 0.503% of GDP. The effect of prolonging the effective working life of the elderly is similar.