The present invention relates to a QFD-TOPSIS web-based quality evaluation method for a construction element technology having a bimodal characteristic, comprising the steps of: receiving basic information and evaluation information of an element technology to be evaluated; Classifying the master technology characteristic and the sub-technology characteristic into at least one required function, setting a master technology characteristic and a sub-technology characteristic according to each required function, selecting m element technology alternatives and target alternatives utilized in the market corresponding to the sub- Setting n sub-technology characteristics according to the m element technology alternatives, setting the sub-technology characteristics to a 1: 1 relationship to the required function, and setting a single independent measure or a semi-technical measure trade-off scale is determined, and if one technical characteristic value is determined by setting the ratiometric scale, , Normalizing the n sub-technology properties of m alternatives composed of different evaluation criteria to a predetermined range, calculating n number of required functions corresponding to the normalized m number of element technology alternatives, Analyzing preferences for each element technology alternative, and sorting the element technology alternatives according to the magnitude of the preference. The method includes the steps of: .
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