  The results of the 2D modelling of Supernova remnant (SNR) RCW86 are given.
Models of this remnant, which for the first time interpret the anisotropy of
surface brightness as a result of the evolution of adiabatic SNR in the
interstellar medium with a large-scale gradient of density, are considered.
Estimations on the basic characteristics of RCW86 and the surrounding medium
which follow from these models are found. It is shown that the observed surface
brightness distribution of RCW86 may be obtaned in the both proposed up till
now models with different initial assumptions: one about a Supernova explosion
in 185 A.D. and another about an explosion in the OB-asossiation. In order to
obtain the observational contrast of surface brightness it is necessary to have
a medium with the characteristic scale of nonuniformity 11 pc if the age of
RCW86 is 1800 years or 20-25 pc when the SNR is distant from us on 2.8 kpc. The
preshock density contrast between the southwestern and northeastern parts of
RCW86 is in range 3.5-4.5.
