Abstract: An improved method for the pipeline environment test, the multi-dimensional vibration technique, is proposed in this paper. With the method, the working environment of the pipeline system can be more precisely simulated. The variation characteristics of the pipeline are obtained with different coherences and phases in the multi-dimensional vibration. The results indicate that both the coherence and the phase play an important role in the pipeline dynamic response. This information may serve as a reference for the simulation and the characterization of the PSD matrix during the pipeline multi-dimensional vibration test.