The Ability of Symbiotic Innovation in Sustainable Technology (ASIST) plays an important role in the sustainable development. It is of great strategic significance for enterprises to evaluate this ability scientifically and rationally. How can we evaluate it in a scientific, rational, standardized and quantitative way? In this paper the author thinks that ASIST is an ability system of multifaceted and multileveled components, such as the abilities of symbiosis with economic, social, natural and scientific & technological resource environment. The evaluation of this ability is a problem of multifactor, multilevel and fuzzy comprehensive decision, so it is reasonable and effective to select and apply the method of Fuzzy Comprehensive Evaluation (FCE). After constructing an evaluation index system composed of 4 factors and 15 indexes, the author proposes and analyses preliminarily the general models and process to evaluate the ability using FCE. The models include the basic, multilevel and multioperator ones and the process composes of 5 main steps. He further illustrates the general solution of the fuzzy comprehensive evaluation of ASIST with a practical example, in the hope of realizing the evaluation to be scientific, rational, standardized and quantitative.