本文首先讨论一般积分器，然后针对一般积分器在精度和速度方面的不足，提出了一种新的自适应积分器的设计思想。根据实际应用设计和实现一个三元二阶自适应积分器，该积分器不仅运算精确度高，而且运算效率高。该自适应积分器运用于“５０工程”———月球探测器直接硬着陆实践应用中，取得了很好的效果。 In this paper, we first discuss the general integrator. Then, in view of the shortcomings of the general integrator in accuracy and speed, a new design idea of ​​adaptive integrator is proposed. According to the practical application of design and implementation of a ternary second order adaptive integrator, the integrator not only high computational accuracy, but also high computational efficiency. The adaptive integrator is used in the “50 Project” - the direct application of the lunar probe direct hard landing, and achieved good results.