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讨论了确定钻井液降粘剂评价中使用的基浆的原则；建议采用具有明确物理意义的降动切力率（简称降切率，符号为ＹＩ，％）表示降粘效果；基于大量实验结果提出了各类基浆的配方及配制程序并对其合理性作了论证；用各种常用降粘剂验证了所选基浆的可行性
The principle of determining the base slurry used in the evaluation of drilling fluid viscosity reducer was discussed. It is suggested that the viscosity-reducing effect should be expressed in terms of the decaying shear force with clear physical meaning (simply referred to as cut-off rate, symbol YI,%) The formula and preparation procedure of various kinds of base pulp are put forward and its rationality is demonstrated. The feasibility of the selected base pulp is verified by various commonly used viscosity reducing agents