In order to resolve these problems of satellite: many model, change big of telecontrol decoding, simulation complex of telemetry parameter, variety of platform interface and so on, put forward a new unitized design of satellite simulator simulation software based on hierarchical system structure. On the basis of analysis the develop process of the ×× model satellite simulator software, through hierarchical system structure and interface standardization method achieve unitized design, and indicated the key technology and the research approach of the farther universal satellite simulator software. Result shows that the design can realize universal of satellite simulator simulation software, accumulated the experience of the universal satellite simulator software developing, and point out the direction.