Embodiments of the present disclosure provide a display panel and a method of manufacturing the same, and a display apparatus. The display panel includes: a display substrate; a packaging cover plate; a sealing assembly. The sealing assembly includes a box dam structure, a buffer structure and a filling structure, the box dam structure forms a sealing space together with the display substrate and the packaging cover plate, the buffer structure and the filling structure are located in the sealing space, and the buffer structure is located between the box dam structure and the filling structure. The box dam structure is made of a first material, the buffer structure includes a second material, the filling structure is made of a third material, and a viscosity of the second material is greater than a viscosity of the third material and less than a viscosity of the first material.