The original meaning of the ancient Chu dialect word of ‘o’ was soak, ‘wo’ ‘wo’ ‘ou’ not only is interchangeability of words of ‘o’, but also similarities in the meaning of the words on the evolution of the relationship. Now, ‘o’ keeps its the original meaning in the place of ancient Chu dialect area, also add the new meaning as mould and mildew in the modern Chinese dialect. It can be said that the modern Chinese dialect is the inheritance and development of the ancient Chu dialect word of ‘o’.