In a protocol parameter selection method and corresponding device, when previewing a current sequence in multiple predetermined sequences, a corresponding reference performance index radar chart is displayed in a standard radar chart, according to a reference value of each performance index in multiple performance indices obtained in advance on the basis of the current sequence. The standard radar chart is a radar chart generated using the multiple performance indices as components and using as a standard a standard value of each performance index obtained in advance on the basis of at least one sequence. The method and device also include determining, as a sequence required for scanning, a current sequence selected according to the reference performance index radar chart and a performance index currently of interest.