I want to use EEG to perform normal and abnormal intergroup analysis. The previous tracing has been completed and the average processing has been performed. How do I perform intergroup analysis now? Is there a tutorial?
Yes, there is usually a tutorial for anything 
Group analysis uses the same statistical processes that are described in the Statistics tutorial:
https://neuroimage.usc.edu/brainstorm/Tutorials/Statistics
In addition, you can check the general recommendations for different analyses in the Workflows tutorial:
https://neuroimage.usc.edu/brainstorm/Tutorials/Workflows
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Thank you very much!