the package includes supplementary data, raw data, the analysis method, and the analysis result of the paper: Validation of Dual-Level Selective Attention Mechanism in Listening Comprehension for Connected Speech in First Language-A Mixed Methods Research. specifically, it includes the original data for the research instruments, including the scripts of listening materials, and the interview. it also includes the raw data for the interview protocol and the two experiments. finally, the analysis techniques and the analysis result were also included.