Abstract: As an important part of the urban water supply project,it is particularly important to ensure that the operation of the dike crossing pipeline is safe and stable.Finding an effective analysis method and identifying the cause of vibration is the top priority to ensure the safe and stable operation of dike crossing pipeline.This paper taking the 6# dike crossing pipeline of Yang’e water plant in Foshan city,Guangdong Province as the research object,first of all,analyze the main vibration source of dike crossing pipeline with the help of mutual correlation power spectrum;Then,the main vibration source is analyzed with the help of time-wavelet scale spectrum to identify the vibration source characteristics of the dike crossing pipeline;Finally,the relevant vibration characteristics of the pipeline are analyzed using the cross wavelet transform.The research results show that:The vibration of the 6# dike crossing pipeline of Yang’e water plant is mainly caused by the multiple rotational frequency such as 29.5Hz and 36.5Hz and the leaf frequency 59.0Hz;The pipeline unit starts to shutdown at 30s,and the time-wavelet scale spectrum of the measurement points shows obvious energy peaks at 32.5s and 42.5s due to the influence of the shutdown process.32.5s corresponds to the first shutdown of the pipeline slow-closing check valve,42.5s corresponds to the second shutdown of the pipeline slow-closing check valve,and the shutdown process is completed when the 6# pipeline unit stops at 44.5s;The pipeline unit begins to startup at 10s,as the unit runs continuously,the 29.5Hz rotational frequency energy continues to increase,the 29.5Hz rotational frequency energy appears a peak and the leaf frequency energy of 59.0Hz increases significantly at 29s,which corresponds to the state of the pipeline outlet valve is opened and the unit startup condition is completed;The peak energy of the relevant vibration of the 6# pipeline is generally concentrated at the frequency of 29.5Hz,and the source of the coupled vibration is the multiple rotational frequency of the 6# pipeline unit.The results of the study can provide a theoretical reference for the identification of vibration characteristics and vibration control of the dike crossing pipeline and can provide new ideas for the analysis of vibration characteristics of similar projects.