Abstract: For the purpose of the highest measuring temperature precision, we have designed filter parameters of the pure rotational Raman lidar, which comprises central wavelength and full width half maximum (FWHM) of two receiving channels. Further research indicates that, when the detected atmosphere temperature decreases or the noise level increases, the designed central wavelength of channel 2 should be set closer to the emission wavelength. In addition, the error produced by simulation formula during retrieving is quite small and could be ignored. At last, the elastic signal should be suppressed to a certain extent, which would induce excursion of retrieved temperature.