Abstarct: Waste recycling plays an important role in the management of energy resources. One of the wasting energy is in LNG regasification process. Traditional methods for LNG regasification of energy consumed to cause environmental impact; addition to wasting energy substantially. In recent years several methods for exploiting of this energy is proposed. In this study, all methods introduced a valuable energy recovery that common methods simulated in this study such as the Air Separation Unit, electric power generation, and the combination of these procedures. Note that these methods must be used in an LNG terminal. This study aimed to reduce energy consumption processes and soft wares using for simulation are Aspen Plus and Haysys. two processes for producing high-purity nitrogen and oxygen in the air separation unit are proposed. The first proposed process is a common process with two distillation tower that consumes low energy. The second process is a combination of parts for air separation unit, LNG regasification and electric power generation. In this process uses from LNG cold energy for pre-cold of enter air in the air separation unit that this action reduces energy consumption process until 58% relative to first propose process. The result of simulation shows that energy consumption in the two proposed processes are lower than prior articles because of 1. Integration on the process 2. Combination of high pressure column condensers with low pressure column reboilers 3. Use of separator before enter some of the streams in the column 4. Pre-cold of enter air in the second proposed process with LNG cold energy. In the power generation section of second proposed process, a rankine cycle with CO2 working fluid and two brayton cycles with N2 and helium working fluid are proposed. In this section of second proposed processe uses from LNG cold energy to condensation of rankine cycle working fluid and pre-cold of working fluid befor enter in to the compressur of brayton cycles.