汉语拼音在众多领域发挥着越来越重大的作用。随着汉语拼音使用范围的不断扩大，声调符号在实际运用中已经不能满足需要。选择几个可以不发音的字母用来不便用符号标调时标调不失为一种可行的补充标调方式，但对用于标调的字母及其在音节中的位置要作出明确的规定。 Hanyu Pinyin plays an increasingly important role in many fields. With the continuous expansion of the use of Hanyu Pinyin, the tone symbol can not meet the needs in practical application. The selection of several non-phonetic letters for inconveniences when using symbols to mark them is a viable alternative, but requires explicit provisions on the letters used for the marks and their syllables.