At the forefront of contemporary science, there are something different between the traditional sci? ence in the prediction on theories and judgment of facts in scientific research. The invention and observation of gravitation waves is a typical event in the invisible world, and it provides a new breakthrough for the study of re? lated issues. In the prediction on theories and judgment of gravitation waves, there is a self-evident problem--the unrepeatable. Analysis of the problem shows that theories are models in the invisible world, and theories cannot fully comply with the facts, but they can get close to the truth through the accumulation of empirical data.