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We found an anisotropic hyperfine structure in the magnetically diluted alloy system, quasi-one-dimensional organic conductor, Co 0.01 Ni 0.99 Pc͑AsF 6 ͒ 0.5 (PcϭC 32 N 8 H 16 ), and confirmed that the doped CoPc was relevantly substituted. The hyperfine signal was replaced by a broad Lorentzian signal at ϳ30 K. The HЌc broad signal shifted and narrowed with increasing temperatures. We interpreted the temperature-dependent g value and linewidth based on Hasegawa's phenomenological theory for dilute magnetic alloys. The density of state at the Fermi level and the exchange energy between the local spin of Co 2ϩ and itinerant hole of the Pc chain were estimated, respectively, as D F ϭ3.8Ϯ0.2 eV and ͉J d ͉ϭ0.013Ϯ0.002 eV.