Abstract: Various kinds of fuzziness found in transportation system are discussed, such as the fuzziness of traffic data and information, the fuzziness of knowledge, the fuzziness of statements of objectives and problem definition, etc. In the meantime, fuzzy decision model is built, and the operation output of fuzzy transportation is assessed through fuzzy inference. The satisfactory degree of various strategies matching the conditions of objectives and constraints are checked by evidence theory. By using more reasonable system model, the optimum decision is made. Different from the optimization of maximum or minimum, adopting this method may find a harmonious satisfactory solution that meets the requirements of objective and constraints.