This study focuses on using curve fitting methodology and power law equation to analyse polyacrylonitrile (PAN) nanofibres morphology synthesised by electrospinning. The effects of polymer solution properties (i.e. polymer concentration, viscosity and Berry number) on electrospinnability of the PAN/DMF (N,N-dimethylformamide) solutions are investigated. For the polymer electrospun from concentrated solution (3.5 < Be < 7.5), the nanofibres form without beads. The relationship between solution viscosity and its concentration is in the form: eta = 0.0205C(4.16), the relation between the diameter of electrospun the PAN nanofibres and solution concentration is in the form: d = 0.0326C(3.45), and the relationship between the nanofibres diameter and solution viscosity is in the form: d = 0.834 eta(0.827)