This study started with the question of whether an efficient and systematic policy based on separate laws was needed in several years after the introduction of the policy in 2013. This study analyzed by dividing the background of enactment of Act on Support for Work in Parallel with Vocational Training on the Industrial Field(Act on WPVT) and the process of policy making into problem stream, political stream, and policy stream, using Kingdon s Policy Stream Framewor. The details of the study were as follows: First, although there was a sense of the need for legislation and discussion of alternatives, legislation was not a political and social issue. Policymakers interest was not high. Second, according to the PSF, policy entrepreneurs can be anyone who has official or unofficial position in the political system. Third, the change of regime and majority party were also meaningful, but the necessity of Act on WPVT was the main for the normative requirement for WPVT at the policy levels such as eliminating youth unemployment, realizing a competence-oriented society through diploma discrimination, and certification of completion. It is expected to provide direction to the theoretical expansion of WPVT, and are expected to provide direction to the delegation of legislation, enforcement decree and rules.