The different acceptance criteria of ground improvement should be proposed for different stratum,especially for granular soil and cohesive soil.Therefore,it is important to use suitable soil classification method to classify the granular soil and cohesive soil.There are 200 CPT tests,SPT boreholes and laboratory tests carrying out in new Doha port project.Then the data will be analyzed and compared among four different soil classifications.It is shown that the different zone from four methods can reveal an apparent grain size distribution.But for the distinction of granular soil and cohesive soil,the Robertson（1990）method can give the best result and the Robertson（1986） takes second place.The Schmertmann and Douglas method give the worst result which will classify the cohesive soil with fine contents between 35% and 55% as granular soil.