  We investigate the gravitation waves produced from QCD and electroweak phase
transitions in the early universe by using a 5-dimension holographic QCD model
and a holographic technicolor model. The dynamical holographic QCD model is to
describe the pure gluon system, where a first order confinement-deconfinement
phase transition can happen at the critical temperature around 250 ${\rm MeV}$.
The minimal holographic technicolor model is introduced to model the strong
dynamics of electroweak, it can give a first order electroweak phase transition
at the critical temperature around 100-360 ${\rm GeV}$. We find that for both
GW signals produced from QCD and EW phase transitions, in the peak frequency
region, the dominant contribution comes from the sound waves, while away from
the peak frequency region the contribution from the bubble collision is
dominant. The peak frequency of gravitation wave determined by the QCD phase
transition is located around $10^{-7}$ Hz which is within the detectability of
FAST and SKA, and the peak frequency of gravitational wave predicted by EW
phase transition is located at $0.002-0.007$ Hz, which might be detectable by
BBO, DECIGO, LISA and ELISA.
