These dyes are bi-functional type having low sensitivity to the fluctuation of the following dyeing parameters: liquor ratio, dyeing temperature, salt, alkali and dyeing time; excellent reproducibility and high solubility, easy to be dissolved. Simafix reactive dyes have medium substantivity and good wash-off. This series of dyes can apply to exhaust process for piece, package yarn, hank, jig dyeing and continuous process andare characterized by excellent yield in all applications.