  This paper proposes a cheat sensitive quantum bit commitment (CSQBC) scheme
based on single photons, in which Alice commits a bit to Bob. Here, Bob only
can cheat the committed bit with probability close to $0$ with the increasing
of used single photons' amount. And if Alice altered her committed bit after
commitment phase, she will be detected with probability close to $1$ with the
increasing of used single photons' amount. The scheme is easy to be realized
with nowadays technology.
