Plenty of cultivated land has been used for highway construction. Thus Land-saving mode in road construction has drawn more and more attentions. However, inappropriate land-saving mode may result in some kinds of risks during highway's service life. Based on road risk, this paper discusses land-saving mode of Congo (Brazzaville) Highway One (Phase Ⅱ), trying to reach the balance between the two after accomplishing literature review and analyzing the prediction of traffic flow. The result shows that, the project should choose the mode such as proper construction scale and high bridge & tunnel ratio, rather than small turning radius and low roadbed.