Propellent designed and developed a kind of new plate heat exchanger of DN250 can use under pressure 2.5 MPa and the test pressure can reach 2.5 * 1.3 = 3.25 MPa on the basis of previous development experience. The test results were successful all at once. Our subsequent successively made resistance to high pressure products such as DN100, DN150, DN250 they have successfully used in the compressor station, primary heat exchange station, high pressure cooling station, high pressure lubricating oil station and other application technology, to realize the ascension of product bearing capacity.