在《微机原理》、《数字电路》及计算机语言课教学中都涉及数制转换这部分内容，其中二进制数和十进制数相互转换是主要内容。运用8421方法可以替代原有的除二取余法和乘二取整法两种方法，实现二进制数和十进制数间快速互相转换，把学生从大量繁杂的简单劳动中解放出来，对《微机原理》、《数字电路》及有关计算机课程的教材建设也很有益处。 In “Microcomputer Principle”, “digital circuit” and computer language teaching are involved in the number of system conversion part of this, in which binary and decimal conversion is the main content. The 8421 method can replace the original two methods except two extractors and two rounding methods to achieve rapid conversion between binary numbers and decimal numbers to free students from a large number of complicated simple labor. “,” Digital Circuits "and teaching materials related to computer courses are also very beneficial.