Abstract: In order to find energy saving and emission reducing measures in environmental control of scaled pig farms, indices of energy saving and emission reduction were calculated and investment economical feasibility was analyzed based on an example of application of ground-source heat pump to scaled pig farm. The results showed that the investment of equipment of ground-source heat pump system was large than that of coal-fired boiler system; the static capital payback period was 6.4 years in present price system of coal and electricity. Ground-source heat pump system could save more energy than coal-fired boiler system, the coefficient of performance (COP) of the ground-source heat pump was more than 4.0, and the primary energy ratio was more than 1.28. In comparison with coal-fired boiler system, ground-source heat pump system could reduce CO2 by 60% and save more water than traditional evaporative cooling system. Therefore, it is an energy saving and emission reducing mode of environmental control for scaled pig farms.