精密系统设计过程中，制造/装配信息存在显著的不确知性，不断提高零件精度指标往往仍难以保证装配性能。为实现小试验样本条件下面向装配性能的精确设计，以测试验证机为物理载体，以参数化孪生数据为“桥梁”，提出孪生数据馈进的精密系统设计方法。首先建立几何/物理状态与信息动态一致的孪生数据表征模型，实现物理特征的数字映射；进而研究基于孪生数据的精密系统装配性能预测方法，实现孪生数据与装配性能的关联；结合多阶段间的信息不确知性，提出小试验样本条件下参数化孪生数据模型、孪生数据馈进机制，通过参数化孪生数据“桥梁”与设计信息（向前）、装配性能（向后）的统筹关联，消减多阶段信息不确知性，实现精密系统精确设计；最后结合某飞行器关键系统设计过程进行应用验证。相关研究对于提高小样本精密系统制造、装配合格率具有积极意义。

In the design process of precision system, there are significant uncertainties for manufacturing / assembly information, and it is still difficult to ensure the assembly performance by continuously improving the accuracy index of parts. In order to realize the accurate design of the assembly performance under the condition of small test samples, a precise system design method of twin data feed is proposed, which takes the testing and verifying machine as the physical carrier and parameterized twin data as the "bridge". Firstly, the twin data representation model with the same geometry / physical state and information dynamics is established to realize the digital mapping of physical characteristics; then, the precise system assembly performance prediction method based on the twin data is studied to realize the correlation between twin data and assembly performance; combined with the information uncertainty of multi-stage, the parameterized twin data model and twin data feed mechanism under the condition of small test samples are proposed. Through the overall correlation between the parameterized twin data "bridge" and design information (forward), assembly performance (backward), the multi-stage information uncertainty is reduced to achieve accurate system design. Finally, the application and verification are carried out in combination with the design process of a key system of an aircraft. The relevant research has positive significance for improving the qualified rate of manufacturing and assembly of small sample precision system.