The critical need of forest road for enchancing the additional values of various forest products, in addition, giving more recreational opportunity to citizen, has been recognized. Recently more people in urban area are searching the forest area for restoring their health from tired city life. Even in the light of this matter, many countries are trying to share more budget to increase forest road density. This country is not an exception, more than this, the Forest Administration set up a long-range plan of forest road construction. To implement this plan, the greatest importance has to be put on the most effective lay out and the density of forest road, involved consideration must be linked with the access convenience, construction cost, recreational purpose, nature conservative and so forth. In this study the present author aimed to ascertain the most effective construction working plan of forest road being fit to Korean geographic condition. To execute this research program, four locations in national forest of Kangweon-do district and other four locations in private forest in chollabuk-do district both where forest roads have previously been constructed were selected to analyze the effectiveness basing upon the various factors separately or in combination. 1. It was appeared that at present the mean forest road density of national forests was 12.28m/㏊ and 5.56m/㏊ in private forest. When compared the figure of private forests with the optimal density 10 m/㏊, significant short has been indicated. Terrain classification was steep(60.8%) in private forest and very steep (80.6%) in national forest. 2. The functions of researched forest roads have been threefold, in the national forests such as effective forest management, ease for cultivational operation and giving people access roads. In the private forest one more weight-added function was to create recreational space. 3. The synthetic evaluation scores of forest road by analytical factors showed Grade II (56-72 points) in the Samcheok area and Grade III (39-55 points) in all the other cases. In near future when the status surounding private forests be improved, the functions of forest road will be further multipled. 4. In making the plan on forest road network in mountainous forest, like in the present research area, must take very consideration pertaining to the slope, soil amount being resulted from cutting and banking practice, because which are subsequently related with using function, cost need and construction difficulty. Therfore it must strongly be recommended on forest road layout on the place where the score of site factor exceed 0.16 and the forest road structure factors ratio should be less than 0.16. 5. The investment efficiency in forest road construction showed to increase in the area where site factors ratio is over 0.15. Also uncovered was that the previously constructed forest road was the community Development Model, however in future the Forest Resource Development Model of forest road should take more importance particularly on those area having site factor ratio less than 0.14. 6. The extractable value of constructed forest road based on forest status factors ratio is expected to increase in case of over 0.16 considerably. 7. In the contrast, if the forest road structural factors ratio is more than 0.16 the effectiveness of the constructed forest road in relation to investment efficiency will be decreased. In turn this means, it is ideal that forest road construction should be undertaken where forest road structure factors ratio is less than 0.15 and so must be sustained. 8. The inducible output generated from forest road was estimated about 35.4 billion won per km including the economic contribution to the secondary induries using forest resources. This amounts almost 88 times of the current output. To do this, the construction cost of forest road was incorporated in culculation. 9. According to the questionnaire analysis collected from 3