To realize the particularly high detection accuracy proposed by World Meteorological Organization (WMO) for atmospheric pressure profile and surface pressure, the interference of turbulence with range-resolved differential absorption lidars and integrated path differential absorption lidars should be removed. A detection beam and a reference beam are converted into a left-handed rotation polarization light beam and a right-handed rotation polarization light beam respectively. Then, both beams are emitted synchronously. The echoes transmitted by atmosphere are separated again by a 1/4 wave plate, a polarized light splitter and two F-P etalons and then are detected. To reduce the error due to the difference between two channels, the division, logarithm and integral operation are processed symmetrically by an analog circuit in real time. The same path transmission, synchronous emission and synchronous receiving of both the detection beam pulse of a differential absorption lidar and the reference beam pulse can cancel the common-mode interference of the factors such as atmospheric random motion with the system. The simulation research results show that the symmetric arrangement of a differential absorption lidar is a most beneficial measure for improving its detection accuracy.