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With the development of global navigation satellite systems, location based services has increasingly become an indispensable part of our personal and professional lives, as more and more people become accustomed to using positioning technology. With the increasing demand for indoor navigation applications, indoor positioning navigation technology based on multi-visual principles has become the center of many technical research efforts, and has matured throughout the past few years. However, when gas-liquid interface is involved, the linear calibration technique that is currently being used is no longer applicable due to the refraction of the line of sight during the propagation process, and therefore becomes the major technical barrier restricting indoor positioning under special circumstances (such as underwater robot operations). This paper proposes a new calibration method that accurately locates the interface position and corrects the linear pinhole model, which can effectively ensure the accuracy of calibration under the circumstances of gas-liquid interfaces, and make field calibration possible during closed measurement. To verify the feasibility and reliability of this calibration method, this paper conducted numerical simulation. Results show small margin of error and indicates that this method satisfies the calibration accuracy requirements in indoor positioning.