Internal Fire Probabilistic Safety Assessment (PSA) is a system analysis method of assessing fire risk for nuclear power plants, which plays a more and more important role. Through the risk-informed fire protection method, the potential design weaknesses and improvement suggestions or requirement can be obtained by carrying out fire prevention design evaluation which making full use of PSA and engineering experience on the basis of the design of disaster protection in deterministic theory. In this paper, fire PSA technology is introduced into the traditional deterministic fire analysis to support the decision-making of design and operation related to internal fire in optimization. A set of system based on fire PSA, the risk matrix and internal disaster protection requirement as the risk evaluation criteria are also developed, and a visual interface is provided to realize the risk design indication of internal fire-related dynamic state management, which is of great significance to engineering practice.