Internal meshing cycloidal gear pump has many advantages in application: small size、light weight、low noise、excellent self-absorption、good flow on the pulse and so on.However

because of the complex shape of tooth profile

the machining is more difficult.Base on the gear meshing principle

the equation of cycloidal gear tooth profile has been derived in the paper

and the approach of two type fillers is discussed.Using Visual Basic6.0 in AutoCAD platform

the parameter drawing of the full gear tooth curve is achieved.It is of great significance for further analysis of the meshing character and the special mechanical properties of the gear pumps.