Abstract: Taking the operation steps of weighing water volume in the virtual simulation experiment for measuring the thermal performance of gas stoves as an example, Analyze the physical parameters and logical relationships required for the design of complex evaluation models under interactive and open operation conditions. Discuss the design experience of virtual simulation experiments with open operation characteristics, especially the uncertainty experimental phenomena and related expression effects caused by many non-established operations. Refine the operation steps of the experiment and the corresponding scoring model. After continuous optimization, it is close to the laboratory experiment in the aspects of experimental purpose, operation complexity, operation duration, operation scoring, experimental test error. Provide reference for the experimental instructors in the construction of virtual simulation experiment project.