CO₂ and CO are called the key indicators of combustion efficiency. Accurate measurement of CO₂ in the combustion flow field is very important for energy conservation and emission reduction in industrial combustion process and engine combustion state diagnosis. Researching intensity, self-broadening coefficient, temperature-dependence exponent and other parameters of CO₂ in high temperature, may improve the accuracy and reliability of measurements for CO₂ concentration. A precise temperature control and pressure control gas spectroscopic parameter measurement system with a design temperature up to 2073K based on absorption spectroscopy has been developed for the measurement of spectroscopic parameters of the R(50e) line at 5007.787cm-1 of CO₂. A large number of high temperature survey spectra of the CO₂ R(50e) line were recorded at temperatures between 1212K and 1873K and many pressures through the system. Through background subtraction, baseline fitting, time-frequency conversion, multi-line combination and nonlinear least squares fitting, and other data processing based on the CO₂ R(50e) survey spectra, intensity, self-broadening full-width and temperature-dependence exponent at temperatures between 1212K and 1873K were obtained. The uncertainty of line strength is less than 1.5%, the uncertainty of self-broadening full-width is less than 4.5%. These parameters are supplement and improvement to the existing database. They are helpful for the detection of CO₂ concentration in combustion diagnosis to ensure the accurate inversion of CO₂ concentration in the combustion process.