This paper revealed the results and problems of practicing the thematic units in the llth grade Japanese subject, ""Contemporary Style of Writings"" in 2001, and inquired into the assignment of developing the curriculum of Senior High School Japanese Language composed of thematic units. On inquiring into the problem of developing the curriculum mentioned above, we showed a figure which explains the five steps in studying and teaching Japanese texts through thematic units. Those steps are as follows; (1) making ready to read at an early stage before reading the texts, (2) understanding each text, (3) discovering interrelationship among the texts in the unit, (4) confirming the theme of the unit, (5) becoming aware of the process of transformation in recognizing the theme of the unit. We found out that there are many assignments in the third, fourth, and fifth steps, among the five steps. The most important problems to be solved is to develop a sequential and systematic curriculum, and learning process which attaches importance to the methods how learners learn.