A linear polymer chain in good solvent condition with one end grafted on a infinitely large, impenetrable flat surface is investigated using dynamic Monte Carlo simulation on a simple cubic lattice. Chain shape and dimension, angular correlation between the direction of the end-to-end vector and that of the longest principal axis of inertia are studied and discussed. Results reveal that the asphericity of end-grafted polymer chains is greater than that of free ones, the limit ratio ?L12? : ?L22? : ?L32? is about 1 : 3.0 : 14.9. The limit of mean angle ?&thetas;? of end-grafted chains is about 22°, smaller than that of free chains, indicating angular correlation between the direction of the end-to-end vector and that of the longest principal axis is reinforced.