The behavior of three-dimensional bond fluctuation model chains tethered on an adsorbing fiat surface was simulated by the Monte Carlo method.The dependence of the number of surface contacts M on the interaction strengthεand the chain length N was investigated by a finite-size scaling law M = N~φ[a_0 +a_1N^(l/v)κ+ O((N^(l/v)κ)~2)]forεnear the critical adsorption pointε_c,i.e.,κ=(ε-ε_c)/ε_c closes to 0.The critical adsorption point was estimated to beε_c=0.93,and the exponentsφ= 0.49 and l/v= 0.57.
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