目的:研究液体混合密度公式在煎膏剂制备中的应用。方法:应用液体混合密度公式考察煎膏剂不同制备过程及条件(浓缩、实验方案设计、饮片提取率不同、辅料密度不同),并结合应用方法和实例。结果:应用液体混合密度公式可预知煎膏剂制备结果,提高操作准确性。结论:液体混合密度公式可在煎膏剂制备各过程中推广应用。 Objective: To study the application of liquid mixing density formula in the preparation of decoction. Methods: The liquid mixing density formula was used to investigate the different preparation process and conditions of the decoction (concentration, design of the experimental scheme, different extraction rate of the decoction piece, different densities of the excipients), and combined with the application methods and examples. Results: The formula of liquid mixed density can be used to predict the preparation of decoction and improve the operation accuracy. Conclusion: The liquid density formula can be widely used in the preparation of decoction.