  Chromospheric brighten and H$\alpha$ surge are the evident and common
phenomena along sunspot light bridge. In this paper, a coronal jet ejects from
sunspot light bridge is presented. Using the data from the Solar Dynamics
Observatory (SDO) and Hinode satellites, it is confirmed that the jet has the
root near light bridge, this suggests that the jet may be a result of
reconnection between main sunspot and light bridge. Due to the processing of
jet ejects, the intensity and width of light bridge have some changes at some
extent. This also suggests that jet is related to the interaction between light
bridge and umbra, possibly magnetic reconnection or heat plasma trapped in
light bridge escaping and moving along field line.
