Aiming at solving the safety issue of the low flash oil used in main power planton offshore platform of oil field A in the South China Sea,comparative analysisof standards from different third party certification agenciesare completed and technical issues of low flash crude oil for different brands of generator are studied. Then, double tube oil transmission technology is put forward with low point flash crude oil transporting through the inner pipe and the volatile gas being separated by the outer pipe. The three layer stereoscopic protection structure is constructed from the generator prime motor to the transmission line, engine room and then to the open space outside of the engine room. In the core layer, low flash point crude oil volatilization is inhibited, and leakage source is isolated; In the middle layer, real-time monitoring is performed; Automatic shut-down and emergency fire prevention system are equipped in the outer layer. This design results have been successfully applied and the problem of low flash point crude oil as the main fuel of power plant on offshore platform is overcome, which reduces the cost of development and operation in offshore oilfield, and has an important practical significance in offshore oil field development.