Abstract: As a part of the decision support system, design and application of subsystem are demonstrated. Climatic factors were estimated for 3911 sites in a half-degree latitude-longitude grid across China, by means of multivariate interpolation technique and a fuzzy model was established for identifying homoclimate of each site compared with species climatic requirement. Bioclimate analysis carried out in computer divided target sites into different levels and mapped by color so that the region where climate were similar to that of species required could be recognized.It was concluded that the system could assist in establishing field trials for species without being tested and delineating suitable areas according to results from trials.As a multipurpose species, Acacia dealbata was used for delineating suitable zones to illustrate the system.

Key words: Introduction, Computer, Decision, Fuzzy, Interpolation: Acacia dealbata.