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Effect of naphthalene series and lignin series dispersants on the sedimentation of coal particles and the stability of coal water slurry (CWS) were investigated using the multiple light scattering technique of Turbiscan Lab stability analyzer. The results show that coalescence between coal particles is the direct factor which causes differential sedimentation, and influences the stability of CWS. The variation of backscattering luminous flux is lower than 0.9%, and the CWS does not produce hard sedimentation in seven days. The average size of coal particle increases gradually along with the extension of standing time. The change rule is not obvious between average size and the ratio of compounded dispersants in the early standing time, but the average size decreases with the increase of additional amount of lignin series dispersants, TSI value shows a decreasing trend, and the stability of CWS increases gradually, which further confirmed the coalescence between coal particles is the main factor that influence the stability of CWS. Turbiscan Lab stability analyzer can realize real-time analysis on the stability and sedimentation process of CWS, and provide reliable data support for the selection of appropriate dispersant and its dosage. [ABSTRACT FROM AUTHOR]