NOVELTY - Fluorescent nanometer granule is prepared by adding synthesized nanometer granule into functional ligand for exchanging and synthesizing into compound nanometer granule; or directly adding functional ligand during synthesis of nanometer granule to realize synthesis of nanometer granule, with weight ratio of organic ligand molecule to the nanometer granule at 0.5-50 wt.%, and reacting at 160 degrees C for 2-24 hours.    USE - The method is for preparing functional compound nanometer granule used for biological fluorescent marking, photoluminescence and electro-material. The granule is used for preparing nanometer granule/polymer composition film material used in constructing optics apparatus, display apparatus, photoelectric apparatus and solar battery. (All claimed)    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation of nanometer granule/polymer composition film material comprising:    (A) preparing compound fluorescent nanometer granule with functionalized surface, selecting and synthesizing organic polymer, with polymer base material having polyacrylic ester and polyacrylamide polymer, macro monomer of polymer, polyurethane, polyurethane oligomer and organic-inorganic hybridized base material;    (B) preparing nanometer granule/polymer composite film material with transfer, dispersion polymerization method, mixing polymers with nanometer granule sol and coating film directly, obtaining composite material film after drying; or adopting situ polymerization, and mixing polymer monomer with nanometer granule sol and polymerizing to form polymer/nanometer granule composite film material;    (C) taking multifunctional acrylic acid, epoxypropyl methacrylate, acrylic ester or polyurethane into oligomer reaction to fix nanometer granule in the polymer network via covalent bond, and crosslinking formed polymer, and adulterating quantity of the compound nanometer granule in polymer at 0-50 wt.%;and    (D) filming in spinning coating, dipping or casting solution mode, using UV initiating polymerization, polymerization or thermal polymerization of azo diisobutyronitrile or initiation free radial of dibenzoyl peroxide, or using combining UV polymerization and azobisisobutyronitrile (AIBN) thermal initiation polymerization, reacting UV polymerization for 30 seconds-10 minutes, and carrying out thermal initiation polymerization at 40-150 degrees C for 3-24 hours.