Two examples of the pulsar and non-pulsar candidates. For the pulsar candidate, there is a narrow peak in the pulse profile plot and a persistent vertical line both in the time versus phase plot and the frequency versus phase plot. And meanwhile, DM curve peaks at a non-zero value. For the non-pulsar candidate, there are a broad peak in the pulse profile plot, and what is more, the pulse only appears in several frequency channels, which indicates that this signal is the RFI.