The Hilbert-Huang transform（HHT）was applied to analyze the pressure fluctuation signal in submerged circulative impinging stream reactor. The intrinsic mode function（IMF） was extracted from the pressure fluctuation in submerged circulative impinging stream reactor（SCISR）. The non-linear and non-stationary characteristics of the pressure fluctuation signals were demonstrated. Analyzing the energy distribution of high, middle,low frequency segment and its transfer within different IMF, the relationship between the flow regimes identification in SCISR and the energy distribution of the different frequency segment IMF were founded. The results show that the rotate speed gradually rose, the impinging course of particles would caused the vortex with different scales and energy distribution of IMF would caused diversification. Hilbert-Huang transform method exposes internality rule between flow pattern and energy distributing of IMF component that is obtained by decomposing pressure fluctuation signal of SCISR using EMD. At the same time, quantificational proof can be provided.