Five patients from 3 families with Becker muscular dystrophy (BMD) were reported. The main clinical and laboratory findings were in common. Pairs of affected brothers are quite resembled each other. However, there are also some variations among different families. The disease occurred later in the first pair of brothers and was accompanied by macroglossia and red-green color blindness, while the second pair got the disease earlier, which was accompanied by heart impairment. It is interesting that both myogenic and neurogenic changes of EMG can be found in the same patient with BMD in our series.