This study analyzed the difference between yatto and youyaku based on Medium Frequency Verbs found in Newspaper Data and Literary Works. ①It was found that youyaku is used in written language and formal sentences for professional information, whereas yatto is usually found in verbal language and informal sentences. ②The High Frequency Verbs used with yatto and youyaku were 「suru」「naru」and「dekiru」.③In terms of the co-occurrence distribution with 'characteristic words', youyaku was frequently used to describe 'abstract relations' and 'natural phenomena', and yatto was used for 'human activities'. In the 'abstract relations' <category>, yatto of the“Newspaper Data”appeared on the exit, termination and stop of an event while youyaku appeared on movement of the landslide, departure and arrival. Further, yatto of the “Literary Works”appeared in efforts, hard work, emotions and thoughts that are put forwarded towards the establishment of an event whereas youyaku represented changes, access, pull and increase/decrease, and appeared to express feelings, senses and thoughts. In the 'Human activities' <category>, yatto of the "Newspaper Data" appeared to express the feelings, thoughts and learning while youyaku appeared to express the emotions and speech acts. In the 'Natural phenomenon' <category>, yatto of the "Newspaper Data" did not occur, and youyaku showed a change in the human condition. Yatto of "Literary Works" indicated a change of external physical state of human body, and youyaku appeared to express a visual change of nature as well as a change of inner state of human body.