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In this paper, we concern the initial-boundary value problem of a system coupled by KdV equations, posed on the half line: u_t+u_xx+6 uu_x = 2 vvx， x > 0，t > 0， v_t + v_xxx + 3uv_x = 0， x > 0，t > 0， u(x，0) = u_0(x)，v(x，0) = v_0(x)， x > 0， u(0，t) = f (t)，v(0，t) = g(t)， t > 0. Then we prove the well-posedness in the low regularity via using an analyticfamily of boundary forcing operators.
Mathematics Subject Classification: 35E15, 35Q53.