Due to various reasons such as complex force transmission paths, low high-frequency analysis accuracy, and insufficient accumulation of experimental data, there is no unified criterion for the formulation of random vibration test conditions for satellite secondary mechanisms. Therefore, during the product development process, we often have to conduct a particular set of mechanical test condition formulation activities, which may be repeated over and again to meet the requirement of the task. This paper proposes a formulation and optimization method of random vibration conditions for satellite secondary mechanism products. The method comprehensively applies the results of component level random vibration test and system level noise test to decompose the random condition to the mounting surface. It offers a practical and effective technical way for the rapid verification of vibration sensitive secondary mechanism products in engineering.