Make standand samples after drying,crushing and sieving the samples which are from the new airport project.In the condition of the same ambient temperature,the same dispersant,and the same single test dose,make contrast experiments by using density meter and pipette method,respectively.According to compare the results by using the two different methods,the content of clay of both methods are nearly equal.It is proved that pipette method has more advantages on smaller error and slighter agitation to suspension.