There are many kinds of thick slurry system, including ceramic slurry, electronic slurry, battery slurry, coal water slurry, etc. They are opaque and have high solid content. Its stability and uniformity have great influence on the performance of downstream products. Traditional particle analysis methods either need to dilute the slurry, which significantly changes the in-situ state; Or it can only measure the properties of dry powder, but can not provide the interface properties of solid-liquid two-phase. Nuclear magnetic resonance relaxation technology makes use of the difference of relaxation time between free solvent and bound solvent molecules, which can quickly determine the nuclear magnetic resonance relaxation time of slurry, reflect the dispersibility of particles through the relaxation time, and calculate the wetted specific surface area of particles in solvent.