Abstract: This paper adopts the standards of Green Gross Domestic Production (GGDP) and Genuine Savings (GS) to conduct a quantitative research on the sustainability of the economic development of Tianjin City, and proposes a new method for the monetary realization of resource values. Research proves that between 1991 and 2003, economic development in Tianjin is sustainable; the rates of resource, environmental pollution and resource depletion amount to 7.35%-10.20%, 1.13%-3.63% and 8.82%-13.02% of the GDP respectively; GDP outperforms GGDP at an annual amount between 3.761 billion and 21.595 billion. The sustainable features will decrease as the coverage of the environmental genes increases.