Typical casting simulation procedure doesn’t consider exact cores and molds material properties as a primary factor. Sometimes mold is considered as an isotropic body characterized with constant averaged thermophysical and other properties. On the other hand there are a lot of practically collected data confirming the fact that input of exact non-uniformly distributed thermophysical mold properties during casting simulation may seriously improve the prognosis of casting quality. The present work is dedicated to interconnections between molds compacting conditions and castings quality. It has been proposed to carry out the computer modeling of compacting process for further use of the calculation results as a part of input for casting simulation software.