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Naphthyl groups are widely used as building blocks for the self-assembly of supramolecular crystal networks. Host–guest complexation of cucurbit[8]uril (Q[8]) with two guests <b>NapA</b> and <b>Nap1</b> in both aqueous solution and solid state has been fully investigated. Experimental data indicated that double guests resided within the cavity of Q[8], generating highly stable homoternary complexes <b>NapA</b>₂@Q[8] and <b>Nap1</b>₂@Q[8]. Meanwhile, the strong hydrogen-bonding and π···π interaction play critical roles in the formation of 1D supramolecular chain, as well as 2D and 3D networks in solid state.