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The goal of this research is to evaluate the existing greenery
tree and shrub species along Sun Yat-Sen National Freeway from
theviewpoints of scenic beauty and maintenance. By SBE（scenic
beauty estimation）method and correlation analysis, we found a
multiple regression model including four variables, color,
management, tree form, tree texture and achieved high
predictive power. The criteria for selecting the species based
on scenic beauty include 1.complete, balanceable and
symmetric tree form; 2.beautiful blossom, fruit or leaf color;
3.keep long time beauty; 4.moderate tree texture. Questionnaire
was used to understand the burden of maintenance. By using item
analysis ,factor analysis and reliability analysis, the
maintenance model and the weigh of item were established. Based
on maintenance, the criteria for selecting trees include easy
restoration after destruction, high adaptability to habitat,
fast growth rate, recovery ability after fire and wind damage.
For the shrubs and vine they must be high pest resistant, easy
to spray pesticides, rapid restoration after disturbance and
fast growth rate. Finally we synthesized these two results.
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