线程模型是一种数学模型，专门针对多线程编程而提供的算法，但也仅是算法，不是实现。本文讲解COM提出的各个类型的线程模型，再说明COM运行时期库是如何实现它们的，就像说明Windows是如何实现线程这个数学模型的一样，最后指明一下跨套间调用和各种类型套间编写的要求以帮助理解。-Threading model is a mathematical model, specifically for the provision of multi-threaded programming algorithm, but only algorithms, not to achieve. This paper put forward to explain the various types of COM threading model, and then shows COM runtime library is how to achieve them, just as Windows is how to achieve the thread shows that the mathematical model, the final cross-apartment call and specify what types of suites written required in order to help understand.