In this study, a partially observed linear quadratic (LQ) non-cooperative stochastic differential game of Markov jump linear system (MJLS) is considered. First, a new proof of filtering theory is given, using the separation principle and filtering technology, partial observations can be transformed into complete observation. Second, nonzero-sum stochastic differential game problem for MJLS are studied using the dynamic programming principle and completion square method.Then, the sufficient and necessary conditions for the Nash equilibrium are obtained. Finally, a numerical simulation is performed.