Abstract: A kind of two-dimensional honeycomb piezoelectric Phononic Crystal(PC) with partial nickel cylinders embedded in 128°YX-LiNbO₃ substrate is proposed.The band structures and transmission loss of the PC are simulated and analyzed using the Finite Element Method(FEM) in combination with low reflection boundary conditions.The results show that the embedded PC has lower SAW band gap than the inverted cone PC.The reason is that embedding part of the cylinder into the substrate increases the mass of the resonator.The vibration eigenmodes at the band gap edges and transmission losses are analyzed.It is found that the first SAW band gap is opened by the local resonance mechanism,and the second SAW band gap has both Bragg scattering and local resonance characteristics.The initial frequency of the first SAW bandgap is estimated by using the mass-spring vibration system,and the result is 82.98 MHz.Furthermore,the effect of cylinder geometry parameters on the bandgap characteristics is discussed.The research lays a foundation for the band gap regulation of micron-scale SAW phononic crystals.