Ceramic tile press ejector adopts a cylinder driven type hydraulic actuator with an asymmetric servo valve controlling an asymmetric cylinder. The static and dynamic mathematical model of pressure characteristics,speed characteristics and transfer function were built. The friction affection on the ejectors pressure and velocity characteristics was analyzed. Analysis of the ejectors stability was finished. Using the simulation model built by use of AMESim and experimental data provided by HENGLITAI, the static and dynamic mathematical model was proved to be correct by comparing the simulation result and experiment result.