Due to the rising regional disparity caused by recent urban-rural discrimination events, the trans-regional transportation projects have become most concerns for the public and their government. This paper supplements the cross-region social assessment of U-typed manpower movement by the related foreign experiences, using the Taiwan's Shea-San Tunnel as an example. The precedent development and strategic stage are introduced as another critical method in conjunction with the data of net migration. Our results indicate that the outcome of the above U-typed manpower movement is insignificant. Finally, the new planning considering a tremendous chasm stage is offered to derive the optimal regional development, aiming at improving the social impacts of the insignificant and unexpected U-typed movement.