In order to provide some useful data for the studies of the radiative and chemical processes in stratosphere, the variation trends of the trace gases (O₃, HCl, HF, NO NO₂, H₂O and CH₄) in stratosphere have been analyzed for various altitudes and latitudes by using the HALOE data from 1992 to 2005. The results show that the trends of the traces gases are different in various latitudes as well as in various levels of stratosphere. Comparing the trends of O₃ with the trends of the other traces gases shows that the recovery of the ozone concentration after the mid-1990s is clear in the upper stratosphere, and the trend of O₃ in these 14 years is opposite to the trend of HCl, HF and water vapor. In the middle stratosphere, the variation of O₃ is complicated. Besides destroyed by the ozone-depleting substances, ozone concentration would be affected by the other factors. The increase trends of ozone mixing ratio from 1997 to 2002 was opposite to the decrease trends of HCl, NO, NO₂ and water vapor. That means the benefits of Montreal agreement which make the decrease of those traces, have won initial success for the recovery of the ozone concentration not only in upper stratosphere but also in middle stratosphere.

