Abstract: The scientific method research is more basic than to get results. This article was a summary of the author's 30 years of scientific research path and the research results. The researches began from some fundamental problems of laser principle, and the laser resonator structure was changed by inducing special optical elements intro/extra cavity. Then various physical phenomena were found with tuning resonator of the two mirrors laser and the three mirrors laser. And we had developed several kinds of precision measuring instruments based on the newly designed laser itself. In this paper, the basic idea of the author's scientific research was summarized, and the physical phenomena found in the laser were introduced briefly, and the scientific system of the laser resonance instruments was established.