To develop an energy system using osmotic pressure generated by a difference in the salt concentration of seawater and fresh water because to prevent global warming, use of natural energy needs to be promoted.

The osmotic pressure type gas compression system is a system using osmotic pressure between seawater and fresh water, or seawater and high salt concentration seawater to compress gas to high pressure by seawater and fresh water, or mixed seawater of seawater and high salt concentration sea water. The system is composed of an osmotic pressure chamber part, a gas compression chamber part, and a compressed gas storage tank part. The above problem is solved by using natural energy by compressing the required amount of gas to high pressure and storing it.