The Wave Based Method (WBM) is a new deterministic method for the vibration problem. It’s based on the indirect Trefftz method, and the vibration are approximate in terms of globe wave functions, which are exact solutions of the vibration control equation. Due to its enhanced computational efficiency as compared to the Finite Element Method (FEM), the WBM can settle the mid-frequency problem. This paper analyses the plate power flow by WBM and compares it with the FEM. The outcome turns out the validity and advantage of the WBM.