  In a composite model of leptons and quarks, composite particles with heavy
Majorana particles appear provided that the V-rishon is regarded as a Majorana
particle. In this paper, the decay mode of such "Majorana partners" is
isestigated. It is shown that the life time of Majorana partners are fairly
long. Our model suggests that a new mechanism of proton decay is possible,
where the X and Y bosons in GUTs are not necessary.
