Abstract: In this treatise the ¹³C NMRresearches of 2,4,7-trinitrofluorenone, 9-dicyanomethylene-2,4,7-trinitrofluorene, 2,4,5,7-tetranitrofluorenone and 9-dicyanomethylene-2,4,5,7-tetranitrofluorene have been made.The ¹³C-¹H coupled,the proton off-resonance decoupled and the decoupled NMRspectra for four fluorene derivatives are obtained at the FX-60 Q PFT-NMRspectrometer (the magnetic field intensity being 14093 G, the observation frequency being 15.4 MHz). With the aid of the techniques of proton off-resonance decoupling, broad band decoupling, and the substituent chemistry shift additivity rules and by the model compound comparison,the chemical shifts and coupling constants of all peaks observed have been determined.The experimental results show, according to chemical shift and coupling constants, that the belonging of different peaks can be recognized and bonded states of unknown compound and substituent electronegativity value can be judged. Therefore, a useful clue may be provided for distinguishing various structures of compounds.