Abstract
In this paper we dealt the process of implementation of agricultural development policy in Hokkaido since 1950 by analyzing the historical relationship between Comprehensive Hokkaido Development Plan and the government-operated agricultural land improvement projects, the progress on project system and its budget, and their outcomes. The analysis of ex-post evaluation of project and of the amount of project-achieved stocks demonstrates the production and productivity of agriculture had been raised as a result of investment since 1950th. On the other hand, the issues on complexity of direction and supervision caused by engagement of multiagency became obvious.