The purpose of this paper is to develop a conceptual model for e-government acceptance in public sector which is one of the least studied aspects of e-government. The proposed model uses theories from technology acceptance and success and the diffusion of ICT-related innovations. It integrates constructs from the technology acceptance model (TAM), the theoretical extension of the TAM (TAM2), the diffusion of innovation (DOI), the updated DeLone and McLean (D&M) IS success model, trust and risk literature, to explain and analyze the factors influencing public officerspsila acceptance of e-government services. The conceptual model, as well as providing a foundation for further empirical testing, will have some practical issue to government decision makers as it synthesizes much of the current research regarding to e-government acceptance into a single model. It will have important policy and strategy implications for helping government in increasing public officerspsila acceptance of e-government usage.