The most of wave spectrum analyzes in Persian Gulf were based on the existing field measurements, but the precision and applicability of the determined spectrum parameters were dependent on number of field wave stations, duration of field data and the spatial distribution of field wave stations. In this research, it is attempted to re-analysis again the wave spectrum parameters presented by previous researches by adding additional data gathered from two wave stations in Bushehr and Lavan to the previous existing data, in order to refine and extend Mazaheri-Ghaderi wave spectrum parameters. The outcome of this research showed that by adding new information and data to the existing ones, the wave spectrum parameters can be refined and modified. The new derived parameters showed better extendibility in the northern water areas of Persian Gulf in respect to previous wave spectrum parameters. In other words, by using the refined wave spectrum parameters, wave behavior can be presented more precisely in the northern water areas of Persian Gulf.