Areviewconcerningthemethodsofstudyinganddescribingwavegroupsispresentedinthispaper.Afteranalysing78fieldrecordscollectedintheShijiuPort,China,themeasuredparametersofwavegroupsandsomefactorsdescribingwavegroupnessandtheirvariationsaregiven.Moreover,theseresultsarecomparedwiththoseoftheory.