To provide a method for supplying a plurality types of stock fibers in a mutually prescribed ratios to a mixing/blowing machine to be blended and opened, even though the fibers are generally opened and weighed separately and put one on another and supplied at different rates, to lower cost dispensing with a fiber-opening machine, e.g. bale breaker, which is needed in the conventional method for one or more types of stock fibers supplied at lower rates than those in the case of the major stocks.

This method supplies a given ratio of a plurality types of stock fibers to a mixing/blowing machines 5 and 6 after opening one or more types of major stock fibers A and B separately by bale breakers 2 and 3 or the like, weighing given quantities of these fibers separately in sequence by a weighing means 10, putting them one on another by type, and manually putting given quantities of auxiliary stock fibers C and D, which are smaller in quantity, on the major stock fibers A and B.