目的 优化美洲大蠊乳膏的基质配方。方法 采用D-最优混料设计，以空白乳膏基质的外观、涂展性、离心稳定性、耐寒稳定性和耐热稳定性5个指标对基质进行评价，确定最优基质配方；同时对主药美洲大蠊药材提取物的加药量进行考察。结果 美洲大蠊乳膏的基质配方为甘油11.00 g、硬脂酸14.00 g、三乙醇胺3.50 g、液体石蜡18.00 g、石蜡10.00 g、水43.50 g；主药加药量为1 g。结论 D-最优混料设计可以较为简便且全面地同步优化出基质配方中每一因素的最优取值，进而使整个配方在外观及物理性质上达到最优。

Objective To optimize the matrix formulation of Periplaneta americana Cream. Methods To optimize the blank matrix formulation by D-optimal mixture design, using presentation, spread property, centrifugal stability, cold stability, and thermostability as evaluating indicators, and to investigate the dosage of P. americana extract. Results The matrix formulation of P. americana Cream was as follows: glycerol 11.00 g, stearic acid 14.00 g, triethanolamine 3.50 g, atolein 18.00 g, petrolin 10.00 g, water 43.50 g, and the amount of P. Americana extract 1.0 g. Conclusion D-optimal mixture design is an effective and systematic method which could optimize the matrix formulation to reach the optimum presentation and physical property.