This thesis, based on a real project, Dongyang-Yongkang expressway, demonstrates the contents that need careful consideration in route scheme study at feasibility study stage, including the determination of the so-called corridor region, technical criterion, selection of the two ends of the roads, and comparative analysis of the route scheme.

On ways to have better project costs control in pre-feasibility study period

Index system and criterion of warship equipment conceptual design during development phase;

Research and realization of product quality integrated system in development phase;

Evaluation model of materiel support plan in development phase based on DEA

And the importance of reliability prediction for missile in the conceptual phase is explained.

In combination with compiling for Techical Code of Investigation for Nuclear Power Plant,the present existing issue of geotechincal engineering investigation in preliminary feasibility stage of nuclear power plant are discussed and relevant approaches are given.