The invention discloses a teaching, training and examining system based on virtual simulation for the gas industry, which is applied to the gas industry, and a use method of the system. The teaching,training and examining system comprises a teaching block, a practical operation training block and an examining block, wherein the teaching block, the practical operation training block and the examining block comprise a model library, a question library and a theoretical value simulation library, the model library comprises a three-dimensional virtual scene, a virtual tool, a device and a system,a third person figure model and the like, and the teaching block and the practical operation training block are provided with a study reminding module. A network teaching, training and examining platform is constructed according to the virtual simulation system. Due to the arrangement of the system, the flexibility of teaching, practical operation training and examining of the gas industry is effectively improved, the cost is reduced, meanwhile, the training effect is improved, no threat is caused to the personal safety of an operator, the use is safe and reliable, and the extensibility is extremely strong. In addition, for the system, the real-time updating of data can be easily realized, the training content is the latest, and a guarantee is provided for the working competence of new workers.