Abstract: The equation for electromagnetic properties of a moving medium is discussed by using electromagnetic field tensor, electromagnetic induction tensor and their dual tensor. It is pointed out that D = ε E and B = μH are untenable in moving medium. Covariant and vector forms of equation for electromagnetic properties of the moving medium are given.

Key words: moving medium, equation of electromagnetic properties, electromagnetic field tensor, electromagnetic induction tensor, eovariant form, vector form