Since 1970, the Port and Airport Research Institute (PARI) has been cooperating with the Bureau of Ports and Harbours, Ministry of Land, Infrastructure, and Transport, and its associated agencies, on the Nationwide Ocean Wave information network for Ports and HArbourS ( NOWPHAS ).
　The PARI has been processing and analyzing the wave records obtained at this network, and has presented the wave statistics in a series of annual reports.
　This technical note introduces the abnormal sea states observation records caused by the Typhoons No.0415, 0416, 0418, 0421, 0422 and 0423 during the year 2004.
　Both zero-up-cross wave-to-wave analysis and spectrum analysis were conducted to explain those abnormal waves characteristics.