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对土中大于０．０７４ｍｍ的颗粒分析采用筛析法，而对于粒径小于０．０７４ｍｍ的土，一般采用密度计法或移液管法．使用自控吸液仪可提高颗粒分析的测试质量和测试效率．
For soil greater than 0.074mm particle analysis using sieve analysis, and for the particle size of less than 0.074mm of soil, the general density method or pipette method. Use of self-contained pipettes increases the test quality and test efficiency of particle analysis.