Index fast estimation method and system

The invention discloses an index fast estimation method comprising the following steps: S1, an index base module acquires data of historical cases, and stores the data in a structured manner to form an index base; S2, a project management module decomposes a proposed project in the form of a tree structure to get a single construction of the proposed project, and stores the data of the single construction in a structured manner; S3, a retrieval module matches an index base for the proposed project according to key content, and gets similar case indexes most similar to the proposed project in the index base through calculation; S4, a storage module stores the data of the similar case indexes in a structured manner; and S5, an estimation adjustment module adjusts the similar case indexes according to the actual situation of the proposed project, and determines the cost indexes of the proposed project. The invention further discloses an index fast estimation system. Case index data sharing and matching and index-based fast evaluation are realized.