The causative union construction of natural language has been an interesting subject to linguists. It is quite natural, therefore, that many linguists should have been interested in trying to unveil the phenomenon of causative union construction. This study aims to analyze Korean ``-ke hata`` Causative Construction under two frameworks of Chomsky`s Theory and Relational Grammar. For this, I have first examined two analyses of Yang (1972) and Kim (1992) based on the framework of Chomsky(1965)`s Theory. Secondly, with the different view point of Chomsky`s analysis, I have mainly looked into ``-ke hata`` Causative Construction in Korean by Relational Grammar based on the grammatical relations and different syntactic levels, which are posited as linguistic primitives. Then I have dealt with Korean causative union construction and formulated syntactic constraints on causative union construction in Korean. As a result, I can propose the following Causative Clause Union Rule for Korean ``-ke hata`` Causative Construction. (1) a. The downstairs intransitive final 1 becomes either a 2 or a 3 in the union stratum. b. The downstairs transitive final 1 becomes a 3, and the final 2 becomes a 2 in the union stratum. c.Other nominals inherit in the union stratum their downstairs final grammatical relation.