With the rapid expansion of information, crucial resources are always limited, so nothing can occupy it/them as long as it wishes. Therefore, it is very important to develop an appropriate task response protocol to control the use of crucial resources. A well-designed response protocol can avoid any task to occupy the crucial resources for too much time so as to prevent other tasks to get effective service. In mass customization information systems , increasing the element number of each production batch can reduced time and cost used for task switching, but it will at the same time greatly increase production cost, so how to balance the two sides in knowledge retrieval becomes a crucial problem. This paper analyzes features in information systems and proposes a general response protocol model. The model is composed by workshop , qualifier and router and both setup time and qualification time are studied. By theoretical modeling and mathematical derivation , it is proved that the time thresholds have extreme points, the model is quite general and can be widely applied. Relevant issues about response protocol system design are discussed.%任务响应是大规模个性化信息系统中的一个重要组成部分，合理的响应机制设计可以避免某一任务过久地占用稀缺资源而阻止其它任务获得有效服务，从而最大化利用稀缺资源，优化系统，提高系统性能。文章以大规模个性化信息系统为对象，研究系统响应机制的特点，构造一个通用的系统应答协议模型，并通过严格的数学推导，证明在应答协议中，时间阈值存在于极值点。最后，基于上述理论结果，讨论了有关任务响应机制的系统设计与优化的问题，以及今后进一步的研究可能。
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