Numbers of path 1,2,3 (P~1,P~2,P~3) can be used to characterize the size, branching and shape of alkanes. According to this, we take P~1, P~2, P~3 (and P~4 in some cases) as separate parameters to predict five physicochemical properties (heat of atomization, heat of formation, heat of vaporation, molar volume, and molar refraction) for alkanes. It has been demonstrated that the method possesses the advantage of easy computation and clear structural significance. The results are also satisfactory.

Key words: PHYSICAL CHEMIEAL PROPERTY, MALAR VOLUME, PARAFFIN