PURPOSE: To vividly dye a silk and wool mixed fiber product in excellent levelness and high fastness by dyeing the wool side at the first stage and dyeing the cotton side at the second stage with a specific different kinds of functional groups-containing bifunction reactive dye.

CONSTITUTION: In dyeing cotton and wool mixed fiber product using different kinds of functional groups-containing bifunctional reactive dye obtained by binding a vinylsulfo group to a dye base structure using a monochloroazine group as a coupling group, the wool side is dyed in weakly acidic bath containing ammonium sulfate at the first stage and then, the cotton side is dyed in a dyeing bath to which Glauber's salt and soda ash are added to vividly dye the both sides in good reproducibility and excellent fastness.