Research on information technology (IT) and information systems (IS) outsourcing has been expanding in recent years and this trend is likely to continue. However, few studies have systematically examined the determinants of partnership quality in IT/IS outsourcing. In this study, we propose a research model to examine partnership quality formation factors in the pre-implementation stage in Chinese small-and medium-sized enterprises (SMEs). Based on previous partnership studies and small and medium business theories, we identify four sets of antecedents of partnership quality characteristics: perceived outsourcing benefits, outsourcing readiness, human characteristics and environmental technical uncertainty. The results of this study show that perceived benefits, outsourcing management competence, outsourcing cognisance and top management's attitude towards outsourcing are significantly related to partnership quality. The implications for theory and practice are discussed.