TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): The linear conjugated polymer derivatives of 9-pyrenylfluorene are prepared by:(A) when m is 1, synthesizing boric acid ester, replacing lithiation halogen atom with butyl lithium, adding methyl borate, producing boric acid by acid hydrolysis, and carrying out esterification with 1,3-propanediol to obtain boric acid ester; adding boric acid ester to replace lithiation halogen atom with butyl lithium, carrying out Suzuki polyreaction, using tetraphenyl(triphenylphosphine) (Ph(PPh3)4)/potassium carbonate (K2CO3) (or sodium carbonate (Na2CO3))/toluene, or diphenyl(dibenzylideneacetone) (Ph(dba)2)/cesium fluoride (CsF)/triphenylphosphine (Ph3P)/1,2-dimethylethane, and adding phase transfer catalysts as quaternary ammonium salt, quaternary ammonium base and crown ether in reaction;(B) when m is 2, replacing lithiation halogen atom with butyl lithium, adding methyl borate, and producing boric acid by acid hydrolysis; carrying out Suzuki coupling reaction with boric acid and mono-bromofluorene to prepare difluorene, using Ph(PPh3)4/K2CO3/toluene, or Ph(dba)2/CsF/Ph3P/1,2-dimethylethane, adding phase transfer catalysts as quaternary ammonium salt, quaternary ammonium base and crown ether in the reaction; using double-bromination reaction, and using bromine (Br2)/ferric chloride (FeCl3), or N-bromosuccinimide (NBS) agent; using Suzuki polyreaction, with Ph(PPh3)4/K2CO3/toluene, or Ph(dba)2/CsF/Ph3P/1,2-dimethylethane, and adding phase transfer catalysts as quaternary ammonium salt, quaternary ammonium base and crown ether in reaction;and(C) when m is 4, replacing lithiation halogen atom with butyl lithium, adding methyl borate, and producing boric acid by acid hydrolysis; using Suzuki coupling reaction, with di-bromofluorene in excess, to produce mono-bromodifluorene, using Ph(PPh3)4/K2CO3/toluene, or Ph(dba)2/CsF/Ph3P/1,2-dimethylethane, adding phase transfer catalysts as quaternary ammonium salt, quaternary ammonium base and crown ether in reaction; using Suzuki reaction with Ph(PPh3)4/K2CO3/toluene, or Ph(dba)2/CsF/Ph3P/1,2-dimethylethane, adding phase transfer catalysts as quaternary ammonium salt, quaternary ammonium base and crown ether in reaction; using double-bromination reaction with Br2/FeCl3, or NBS agent; using Suzuki polyreaction with Ph(PPh3)4/K2CO3/toluene, or Ph(dba)2/CsF/Ph3P/1,2-dimethylethane, and adding phase transfer catalysts as quaternary ammonium salt, quaternary ammonium base and crown ether in the reaction.