In November 2014, China Government officially proposed for the first time through U. S.-China Joint Announcement on Climate Change that China would achieve its CO_2 emissions peak around 2030. Energy activities contribute more than 90% to total CO_2 emissions in China. Energy carbon emission mitigation is essential for the 2030 peak goal. It is known that the energy carbon emission is determined by the total energy consumption and its structure. And the total energy consumption and its structure is determined by macroeconomic and social factors such as GDP growth, total populations and its structure, industrial structure, energy policies, fiscal institutions and so on. So the research of carbon emission peak should base on macroeconomic and social factors such as GDP growth, total populations and its structure, industrial structure, energy policies. In order to quantitatively analyze the path of carbon emission from energy consumption and overcome the complexities of the mechanism between the macro economy and the energy carbon emission, IESOCEM (Intertemporal Energy System Optimization and Carbon Emission Model) has been established and adopted in this paper on the basis of reference energy system and mathematics programming algorithm using the platform of GAMS. Firstly, some macro indicators in the period of 2015-2050 such as GDP growth, total populations and its structure, industrial structure are assumed according to the New Normal Trend. Then the energy services demands have been forecasted accordingly, which drives the IESOCEM model to compute the total energy consumption and its structure and carbon emission as an economic and feasible scheme for the 2030 carbon emission peak goal. The computed scheme is as follows:the total energy consumption will increase gradually from 3. 91 billion tce(tonne of standard coal equivalent) in 2015 to 6. 265 billion tce in 2050 with annual growth rate slowing from 1. 8% to 0. 6%;the percentage of coal in the total primary energy consumption will drop from 64% in 2015 to 45% in 2050, while oil from 17% to 8%, natural gas from 7% to 11%, non-fossil energy from 12% to 36%; CO_2 emission will experience fast growth in the period of 2015-2030 from 8. 01 billion tonnes to 9. 35 billion tonnes arriving the peak with the average growth rate of 89 million tonnes per year, then decline slowly to 9. 15 billion tonnes in 2050 with the average growth rate of 10 million tonnes per year. The carbon emission peak scheme is compared with the actual situation of energy and carbon emission in the year of 2013 and then policies suggestions are proposed. In order to make the 2030 carbon emission peak realized, systematic measures should be adopted in the period of 2015-2050:public-private partnership should be used and promoted to attract civil capital invested to renewable energy infrastructure for the increase of percentage of renewable energy in total energy consumption;China should enlarge gas imports and strengthen its bargaining power in gas imports through the establishment of gas imports union, encourage private capital to accelerate the construction of gas pipelines networks and gas storage facilities; the institutions of resource taxes, environmental taxes and consumption taxes should be reformed to accelerate the low-carbon transition of energy resource utilization.