由用户执行，不需要操作系统的特别支持，覆盖结构的程序设计很复杂。

Implemented by user, no special support needed from operating system, programming design of overlay structure is complex.

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讨论了结构覆盖测试技术和程序复杂度，研究了基于决策到决策路径(DD -路径)的代码覆盖技术。

Structure coverage testing technology and program complexity is discussed, and the code coverage technology based on decision to decision path (DD-path) is studied.

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对测试具有循环结构的程序，给出一种新的思路，用来选取符合路径覆盖要求的测试方案。

For the program with cycle structure, the paper gives a new method of selecting the scheme of test according to the demand of route covering.

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