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A novel complex obtained by the solutions of trichloromethane containing adamantanecarboxylic acid and hexamethylenetetraminereaction.X-ray single crystal diffraction test and structural analysis show that the space group of the compound belongs to orthorhombic crystal system and Pnma space group in RTP.while crystallizes in an monoclinic crystal system and P21/c space group in LTP.DSC and dielectric properties tests show that the compounds undergo a reversible structural phase transition with a Curie temperature of 263 K.The stepwise synergistic disordering of adamantanecarboxylic acid leads to the sequential reversible phase transitions and symmetry breaking.