The study focus on testing the determinants of competitive advantage of dates marketing from Saudi Arabia through multi- regression model based on Porter’s diamond, which is determined the factor that affecting on competitiveness of nations in international marketing, such as factor conditions, demand conditions, related and supporting industries, and company strategy; structure; and rivalry. Our study selected the most competitive countries for Saudi Arabia in marketing dates in its markets (like Egypt, Iraq, and Tunisia). The results of study showed that the four determinants are significant and R square is high more than 95% in all equations this is agree with our assumptions, but the signs parameters of these determinants are different from our expectations specially with the quantity of production in Saudi Arabia which appear negative with the value of export of dates from KSA, that is because the consumption of dates in domestic market is high and it absorbs the high quality kind of dates, which is needed for external market. We tested also the same determinants for the competitive countries (Egypt, Iraq, and Tunisia); we found the same results, except Egypt, which have huge domestic demand that is effect on demand conditions in this country. Our study suggested more studies are needed for related and supporting industries of dates with this crop, to save data base in this field, and give more attention for quality of dates, packaging and prices for Saudi exporting of dates.