本文对动态逻辑重构单元的本质、重构原则和方法作了详细分析，并首次提出了机床相容性指数和零件相容性指数的新概念，其物理意义明确，据此所提出的数学模型反映了单元重构的本质要求．文章最后提供的实例表明，本文所建立的模型明显优于现有的同类模型。 In this paper, the essence and reconstruction principle and method of dynamic logic reconfiguration unit are analyzed in detail. For the first time, a new concept of machine compatibility index and part compatibility index is proposed. Its physical meaning is clear. According to the proposed mathematics The model reflects the essential requirements of the unit reconstruction. The last example provided by the article shows that the model established in this paper is obviously superior to the existing similar models.