In order to find out the effect of dip angle (the angle between moistube and horizontal plane) and pressure on the flow of moistube in the air, and to determine the relationship between moistube dip angle, pressure and the specific discharge, the discharging characteristics of moistube was studied through laboratory test under conditions of different laying angles (0°, 30°, 45°, 60°, and 90°) and different pressure head of 0° and 90°. The results indicate that the flow of moistube accords with Darcy's law, the specific discharge of moistube increases with the increase of pressure head and there are good linear relationship between them. Under the same water pressure head, the specific discharge of moistube increases with the increase of the angle and has a linear relationship with the inclination of sine, while the moistube angle can be converted into equivalent head.Thecalculation formula of moistube specific discharge including angle and pressure head is put forward. The research results can provide basis for the planning and design of the micro embellish irrigation works.