本文提出一个语法分析中的规则动态选择与路标记忆算法，该算法提出了实时记录规则调用频度，通过调用频度对规则进行动态选择的处理方法以及设置路标信息记忆表以减少回溯次数的语法分析思想，通过对该算法的设计与分析，深入探讨了快速、高效的语法分析器设计方法以及规则优先次序的动态选择方法。 In this paper, we propose a rule-based dynamic selection and road marking memory algorithm in grammar analysis. This algorithm proposes a method to record the frequency of rules in real time, dynamically select the rules by calling the frequency, and set the syntax of the landmark information memory table to reduce the number of backtracking Through the design and analysis of this algorithm, this paper explores the rapid and efficient design of parser and the dynamic selection of rules prioritization.