Based on the similar physical simulation theory, we investigated the physical simulation similar regulation during Ti alloy melt filling flow in centrifugal field. And by means of similar physical simulation method, the variation of flow was studied during Ti alloy melt filling flow in centrifugal field. The results show that the melt flow meets both Cn criterion and Reynolds criterion in the centrifugal field upon filling, model fluid fill the mould along the back wall of cross gate, the free surface of fluid is a regular curved surface in the spindle centers, the cross section of fluid decreases with increasing of rotation speed and filling length. At the same time, the higher the rotation speed, the smaller the filling speed and length