This study mainly investigated modality adverbs in Modern Chinese. To investigate the characteristics, subclassification, and scope of Chinese modality adverbs, We have studied on ‘concepts of modality and mood’ and ‘subclassification of modality adverbs and mood adverbs’ through previous studies. After that, We presented the perspective of this paper, and reclassified 324 adverbs that presented in previous studies based on ‘modal meanings’. It has come to the following conclusions:BR First, in previous studies, the concepts of modality and mood are mixed. In the field of Western grammar, some scholars claim that modality is the semantic field, mood is the grammar field. This reflects the characteristics of ‘inflectional language’, but Chinese is ‘isolated language’. So at the time of accepting the concepts of modality, it can be seen that the concepts were mixed. In order to solve this problem, this paper distinguished concepts of modality(情態), mood(语氣₂), tone(口气).BR Second, in previous studies, each scholar’s classification for modality adverbs and mood adverbs didn’t match. However, researching on the adverbs suggested in previous studies, all of them can be distinguished as dynamic modality, deontic modality, epistemic modality, tone, etc., but tone doesn’t mean modality. So modality adverbs are generally divided into dynamic modality, deontic modality and epistemic modality. Also recently some scholars claim that ‘evaluative modality’ should be classified as a category of modality, but none of the adverbs can be found to indicate the meaning of evaluative modality.BR Third, after collecting a total of 324 adverbs of modality adverbs and mood adverbs in previous studies, 211 adverbs were excluded for two reasons(not included or presented in a different meaning in XIANDAI HANYU CIDIAN(『现代汉语词典(第7版)』), not indicated the meaning of modality). The remaining 113 adverbs were reclassified into dynamic modality(will), deontic modality, and epistemic modality. Adverbs with multiple modality in the same word were indicated by ‘Bi(必)₁, Bi(必)₂, Bi(必)₃’, and a total of 156 adverbs were classified in this paper. The results of the reclassification are as follows. There are a total of 29 dynamic modality adverbs accounting for about 19% of the total modality adverbs, and a total of 46 deontic modality adverbs accounting for about 29%, and a total of 81 epistemic modality adverbs accounting for about 52%. As the classification results, epistemic modality adverbs are the largest number of modality adverbs.