Ink-jet printing procedure of Nomex^® fabrics and the optimized paste formula were studied by single factor experiments and orthogonal experiments. The K/S value, brightness, whiteness and color fastness of printed fabrics were determined. The experimental results showed that the color and fastness of printed fabrics are bright and satisfied. The reasonable dosage of penetrate agent WL is 1 g/L.The steaming temperature and time are 130 ℃ and 45 min respectively.