Manufacturing method of a composite structure, the composite structure comprising a laminate that comprises a set of plies (11, 12, 13,...), the composite structure having an X-axis and a Z-axis and the laminate: - extending between a first edge and a second edge in the X-axis, - comprising, in the X-axis, a rising ramp and a falling ramp, rising and falling according to the Z-axis which is positive towards the top of the ramps (4, 5), - the rising ramp comprising a starting point in the X-axis in which the rising ramp starts to increase its height in the Z-axis, and an upper point in which the rising ramp has its maximum height in the Z-axis, the starting point being located in the X-axis between the first edge and the upper point, - the falling ramp comprising the upper point in which the falling ramp has its maximum height in the Z-axis and an end point in the X-axis in which the falling ramp has its minimum height in the Z-axis, the end point being located in the X-axis between the upper point and the second edge, characterised in that the method comprises the following steps: - lying a first ply from the second edge to a ply end located, in the X-axis, in the proximity of the starting point of the rising ramp, - cutting the first ply at the ply end, - lying a second ply partially located over the first ply in the positive direction of the Z-axis, the second ply laid from the first edge to a ply end, in the X-axis, in the proximity of the end point of the falling ramp, - cutting the second ply at the ply end, - lying a third ply partially located over the second ply in the positive direction of the Z-axis, the third ply laid from the second edge and being shorter than the first ply so that its end is stepped with respect to the end of the first ply, - cutting the third ply at the ply end, - lying a fourth ply partially located over the third ply in the positive direction of the Z-axis, the fourth ply laid from the first edge and being shorter than the second ply so that its end is stepped with respect to the end of the second ply, - cutting the fourth ply at the ply end, - lying successive plies (15, 16,...) partially located over their preceding ply (14, 15,...) in the positive direction of the Z-axis, and that are alternatively laid from the first edge or the second edge and are shorter than the ply located before the preceding ply so that their ends (43, 44, 52, 53,...) are stepped successively until they reach the top of the ramp (3, 4) and cutting the successive plies (15, 16,...) at their ends (43, 44, 52, 53,...). - extending between a first edge and a second edge in the X-axis, - comprising, in the X-axis, a rising ramp and a falling ramp, rising and falling according to the Z-axis which is positive towards the top of the ramps (4, 5), - the rising ramp comprising a starting point in the X-axis in which the rising ramp starts to increase its height in the Z-axis, and an upper point in which the rising ramp has its maximum height in the Z-axis, the starting point being located in the X-axis between the first edge and the upper point, - the falling ramp comprising the upper point in which the falling ramp has its maximum height in the Z-axis and an end point in the X-axis in which the falling ramp has its minimum height in the Z-axis, the end point being located in the X-axis between the upper point and the second edge, - lying a first ply from the second edge to a ply end located, in the X-axis, in the proximity of the starting point of the rising ramp, - cutting the first ply at the ply end, - lying a second ply partially located over the first ply in the positive direction of the Z-axis, the second ply laid from the first edge to a ply end, in the X-axis, in the proximity of the end point of the falling ramp, - cutting the second ply at the ply end, - lying a third ply partially located over the second ply in the positive direction of the Z-axis, the third ply laid from the second edge and being shorter than the first ply so that its end is stepped with respect to the end of the first ply, - cutting the third ply at the ply end, - lying a fourth ply partially located over the third ply in the positive direction of the Z-axis, the fourth ply laid from the first edge and being shorter than the second ply so that its end is stepped with respect to the end of the second ply, - cutting the fourth ply at the ply end, - lying successive plies (15, 16,...) partially located over their preceding ply (14, 15,...) in the positive direction of the Z-axis, and that are alternatively laid from the first edge or the second edge and are shorter than the ply located before the preceding ply so that their ends (43, 44, 52, 53,...) are stepped successively until they reach the top of the ramp (3, 4) and cutting the successive plies (15, 16,...) at their ends (43, 44, 52, 53,...).