further to achieve even exiting air effect and improve painting quality application_number US 201314134355 A description in view of the problems existing in the spraying operation of spray gun to obtain even pressure result when the spraying paint airflow and atomization airflow are guided and spit out leading to difficulty in maintaining stability the inventor engaged in the research of improvement due to many years of experience in related industry and technique the paint spray gun even pressure diverting housing structure is further invented with the purpose of improving the design of structure to increase the spraying range of the atomization airflow when the paint is just sprayed out in diverting structure in order to effectively squeeze the paint to form more even long and flat spraying style the other objective of the present invention is in the design of structural plan of diverting airflow housing that enables the paint airflow and atomization airflow of the spray gun to go through the diverting housing in circulating manner thereby extending the staying time and obtain even pressure spitting result making the spraying of paint more evenly distributed to achieve the objective revealed above the diverting housing of the present invention uses the composite model of inner housing and outer housing wherein an isolation ring existed in the inner lateral face of the inner housing in order to isolate the spraying paint air hole and atomization air hole installed in the spray gun head cavity of the spray gun within the radius of the isolation ring a reserved number of guiding steam gap holes are installed and the inlet and outlet of the guiding stream gap holes are presenting non penetrating crossly located guiding style and in the peripheral edge of the inner housing.