In order to improve the flight economy of civil aircraft and reduce its environmental impact,the vertical flight trajectory models were established based on the continuous flight profile which is described in theNext Generation Air Transportation System. Synthesizing both of the economy and environmental impact metrics,the vertical flight trajectory of civil aircraft was optimized. Taking a passenger plane as an example,the optimization objectives were the direct operation cost,the total global warming potential and a synthesis objective,and the flight trajectory were analyzed and optimized with the various ranges for the NextGen continues flight profile. The results indicate that the altitude has great influence on the emissions, whereas the direct operating cost is more sensitive to the endurance and the fuel consumption.