This study attempted to describe detailed observations of actual developmental pro- cess of joint attention frame. A case study was conducted repetitive changing processes of mother and infant’s interaction using the same set of toys between the ages of 7– 16months. 55times of “Build and break block events” were analyzed. The following results were obtained. First, three type of action building block up by mother and three type of action breaking block by infant was classified. Second, at each month, there was change in infant’s action pattern. The results show developmental changes that infant’s action which was adjusted to single event gradually became to be adjusted to repetitive events and to be a lower procedure for other acts. Third, arrangement of blocks layout which the mother brought about gave the opportunity for these changes to arise. This issue might reveal some of “field of promoted action”, which was presented by Edward Reed (1996).