可靠性是产品研制合同中的一个重要指标，是考核产品是否研制成功的必要依据，也是影响产品寿命周期总费用的重要因素。当前产品研制合同中有关可靠性指标方面存在着指标要求不明确，不切实际的高指标等问题。应把产品的使用要求，相似产品的可靠性水平以及费用、进度、保障条件等作为确定可靠性指标的依据。实施中还应注意研制各阶段可靠性量值间的时序关系。 Reliability is an important indicator in a product development contract, a necessary basis for assessing whether a product has been successfully developed, and an important factor affecting the total cost of a product’s life cycle. In the current product development contract, there are some problems on the reliability index, such as the unclear index requirement and unrealistic high index. The use requirements of the products, the reliability level of the similar products as well as the cost, schedule and guarantee conditions should be used as the basis for determining the reliability index. In the implementation, attention should also be paid to the timing relationship between the reliability of development stages.