Based on the Schwarzschild solution of general relativity, the acceleration of freely-falling bodies in the gravitational field due to single isolated mass is studied. For simplicity, I consider radially freely-falling bodies. At each spatial position, the acceleration depends linearly on the body's energy of unit mass, and low energy bodies accelerate toward the central mass (suffer attracting forces) while high energy bodies decelerate (suffer repulsive forces, contrary to people's imagination). Photons have the maximum speeds and, therefore, suffer repulsive forces. This result is verified by the standard radar-echo-delay experiments. Einstein's equivalence principle is that, over any small region of space and time, all test particles would have approximately the same acceleration. The local observational frame which shares the same acceleration would see each particle being either static or moving straightly with constant speed and we would see the cancellation of gravity by choosing coordinate frames locally. This resembles the way that any local area of curved surface is flat. The above result unseats Einstein's equivalence principle because locally we can not choose one observational frame which accelerates and decelerates simultaneously. The above-said resemblance further led Einstein to the assumption of curved spacetime which is, therefore, a big mistake. DEAR freinds, This time I can not help you connect to my academic paper because it is rejected by arXiv.org. If you have a server and help me post the paper, I would be very happy. Yours.