Abstract: In order to research and develop the spraying technology in gas and liquid two-phase flow, the technology and its apparatus for the fog applying the pesticide with the normal temperature, and to solve the new problem of pesticide application for the prevention and control of diseases and insects in the protected agriculture further, a two-phase flow spraying test-bed has been developed. On the basis of data processing by hand, an auto test system has been developed, which is controlled by a computer to test, record, process data and draw curves or tables synchronously for the test method of main technical parameters, indicated readings on the meters, recording and data processing by hand, during the program of two-phase flow spraying. This auto test-bed is of better functions, high precision and the error difference in single test <2.5%, as well as solved the problem of pointing at the site. The study of two-phase flow spraying technology, the properties test and the product's quality for the normal fog sprayers under the operative conditions at natural temperature, can be applied by the test-bed.