This paper presents some results of an experimental study of the temperature behavior of the collisional self–roadening of the 313–220 water vapor absorption line in the ground state in the temperature range 266–376°K. It is shown that temperature dependence of a self–roadening parameter can be approximated, accurately to the measurement error, by a power law with the power factor N = 0.66 (6). A comparision of experimental results with data of other experiments and theoretical predictions is carried out.