A CO 2 infrared remote sensing system based on the algorithm of weighting function modified differential optical absorption spectroscopy (WFM-DOAS) is developed for measuring CO 2 emissions from pollution sources. The system is composed of a spectrometer with band from 900 nm to 1700 nm, a telescope with a field of view of 1.12 • , a silica optical fiber, an automatic position adjuster, and the data acquisition and processing module. The performance is discussed, including the electronic noise of the charge-coupled device (CCD), the spectral shift, and detection limits. The resolution of the spectrometer is 0.4 nm, the detection limit is 8.5 × 10 20 molecules•cm −2 , and the relative retrieval error is < 1.5%. On May 26, 2018, a field experiment was performed to measure CO 2 emissions from the Feng-tai power plant, and a twodimensional distribution of CO 2 from the plume was obtained. The retrieved differential slant column densities (dSCDs) of CO 2 are around 2 × 10 21 molecules•cm −2 in the unpolluted areas, 5.5 × 10 21 molecules•cm −2 in the plume locations most strongly affected by local CO 2 emissions, and the fitting error is less than 2 × 10 20 molecules•cm −2 , which proves that the infrared remote sensing system has the characteristics of fast response and high precision, suitable for measuring CO 2 emission from the sources.