The aim of this paper is to study usage pattern and distribution of conjunctive adverbs of elementary students based on a spontaneous speech corpus. Elementary students are lower token frequency and higher distribution preponderance of conjunctive adverbs by comparison with adult. In particular, token frequency of {Geurunde} and {Geurigo} are high and {Geurunikka} is low. Elementary students use the various function of conjunctive adverbs in the same way as adults but usage preponderance of [unmarked conjunctive] is higher than adult. Also, they use less discourse marker functions of {Geurunikka}. Elementary students show the reduction pattern of conjunctive adverbs the same as adults, but it takes less conjunctive adverbs reduction of elementary students compared to adults. It is also for discourse strategic intonational phrase pattern using the access conjunctive adverbs to be showed the same pattern with adults but used relatively less.