The final purpose of the seventh National Curriculumm is to help students improve the ability to use the Korean language creatively. Also, it stresses that, in the education of the knowledge students need to know, the method should not just carry the knowledge to students but help students have experiences of generating knowledge through activities of exploring the phenomena of the use of the Korean language and be able to use the learned knowledge in real situations. This study, therefore, focused on exploring study and cooperative learning out of a variety of teaching and learning methods in the area of the Korean language. Exploring study is the way by which students solve the problems for themselves to find out meanings from experiences. This coresponds to the fundamental approach of the curriculum emphasizing the student-centered and self-initiative learning. And Cooperative learning, a kind of small-grouped learning, means the way to emphasize the cooperative activities among peers by giving the same objective to each group or to involve students in trying to attain the given learning tasks or learning objectives cooperatively in small groups. The cooperative learning that help students have interests in learning through active cooperative activities, competition among groups and reward can be the effective way in Korean knowledge education in which teachers usually have difficulties in arousing students' interests. Therefore, this study suggested the method through which students can learn the knowledge of the Korean language with more interests and for themselves by applying the naturally mixed model of these two learning ways. Also, it tried to devise the method that can be applied to real classes for teaching and learnling the knowledge of the Korean language and to enhance the praticabillity of the model by applying it to the unit included in the course for the third grade students, ""Use of The Korean language in real lives"". In Chapter II, exploring study and cooperative learning are theoretically investigated through the study of related literatures. That is, the concepts and figures of these methods are studied, and their feasibilities and effects in the knoweldge education of the Korean language are also considered. And, the pre-condition was investigated through questionnaires concentrated on students' experiences, the preference, and the advantages and disadvantages of cooperative learning and exploring study in groups. Based on the research, the way how students can participate in class with interests is discussed by analyzing the reason why students feel the knowledge area of the Korean language is difficult. Based on the theoretical considerations and the result of the questionnaires, the feasible model using cooperative learning and exploring study was devised. In Chapter III, according to the specific teaching-learning plan to apply the model suggested in Chapter II to experimental and controlled groups selected out of the third grade students the experimental class is developed. In Chapter IV, the result of the experiment is analyzed, focused on the effect in the cognitive and affective domain, and, in Chapter V, the result of this study is concluded, focused on its meaning and limitations. The result is the following: First, in terms of achievement of learning, its degree in the experimental group that cooperative learning and exploring study were applied was meaningfully higher compared to its degree in the controlled group. The significance level between the experimental group that both cooperative learning and exploring study were applied and the controlled group that those were not applied was 0.05. Particularly, considering the average score of the experimental group(71.3S) and the controlled group(64.78) in the posttest, the teaching and learning method suggested in this study were proved to be effective for improvement of achievement degree in learning the knowledge of the Korean language. Second, in terms of the affective attitude of the knowledge of the Korean language, as a whole, the experimental group shows more positive changes, compared to the controlled group. This presents that the cooperative learning through reward and competition can give students positive affects for learning the Korean language as a subject and the attitude of the knowledge of the Korean language. Generally, this lesson was planned as the model to make students participate in classes appropriate to their level, so it helped students be involved more actively in the student-centered class, have interests through reward and competition and change the attitude of the subject positively. This study deals only with the part out of the area of the Korean language knowledge, so it seems to lack the objectivity with regard to the verification of the effect of the teaching and learning method using cooperative learning and exploring study. However, this study is meaningful in that it corresponds to the fundamental approach of the seventh National Curriculum and devised the method of the teaching and learning the knoweldge of the Korean Language to improve teaching methods in middle schools. Further studies on cooperative learning and exploring studies in the knowledge of the Korean language and specific and real development of the teaching and learning method are required in the future.