A method for forming a chip package structure is provided. The method includes disposing a first chip structure and a second chip structure over a wiring substrate. The first chip structure is spaced apart from the second chip structure by a gap. The method includes disposing a ring structure over the wiring substrate. The ring structure has a first opening, the first chip structure and the second chip structure are in the first opening, the first opening has a first inner wall, the first inner wall has a first recess, and the gap extends toward the first recess.