Synchronizing and detecting method capable of resisting noise and wave-shape distortion and relative device

The method includes steps: carrying out multiple time of sampling for start code in access code, and field of sync character, and granting different weight values for each sampling point based on reliability; using correlator to obtain similarity value, and time point is setup for activating timer to start counting when the said similarity value exceeds an initial threshold value; when timer timing reaches within a given observing time, the time point, where the correlator obtains maximal similarity value, is as best time sync point to reach bit synchronization and frame synchronization of system; moreover, bit detection can be carried out by using the said best time sync point as reference point. The invention raises capability of anti noise and anti waveform distortion, and prevents known non-synchronization or error synchronization from happening.