The most contentious problem facing post-independence NIGERIA is the phenomenon or fear of national disintegration. There was a tragic Civil War. from 1967 - 70, military seizures of political power and numerous constitutions had been written and discarded. As long as Nigeria continues to grapple with the problem of nation - building, Integration will remain a topical issue. For this reason, the Federal Military Government conceptualized the National Youth Service Corps in 1973 to pilot the formula for achieving full integration and unity. The aim of this study is to evaluate the effectiveness of the National Youth Service Corps Scheme as an instrument for promoting national integration in Nigeria with a view to making recommendations. The timeframe of study is from 1986 ~ 88. The objective of the study can be seen from the theoretical and practical dimensions. Specifically, the study will enable us understand the process of national integration and the dynamics of the movement of Youth Corpers across geographical and cultural boundaries. The theoretical frame work is the Social Communications - Transactional Theory for Political Integration. Three hypothesis are advanced on the dynamics of the movement of Youth Corpers across geographical and cultural boundaries. The population and unit of analysis comprised Youth Corpers who served 1986/87 designated Post-Corpers and 1987/88 designated Pre-Corpers. The catchment area is Anambra (Anambra/Enugu and part of Ebonyi) Benue (Benue and part ofKogi) Kaduna (Kaduna/Katsina) Lagos States and Abuja FCT Recourse is to made to the techniques of Kolmogorov Smirnov and Chi-Square for the purpose of applying statistical test to the null hypothesis. The results and findings proved that the NYSC promotes national integration and unity through interactions with other Nigerians. The study had postulated that national unity is a function of contact dynamics in a nation - state. It is recommended amongst others that the Federal government should replicate this study at the national level for policy and cost benefit analysis.