This paper is concerned with the H ∞ filter design for continuous-time singular systems with Markovian jump parameters, whose system mode is transmitted through an unreliable network. In contrast to the traditionally mode-dependent or mode-independent filtering method, a new partially mode-dependent filter is established via using a mode-dependent Lyapunov function, where the stochastic property of mode available to a filter is considered. Sufficient conditions for the existence of H ∞ filter are obtained as strict linear matrix inequalities. Finally, numerical examples are used to show the effectiveness of the given theoretical results. Copyright © 2012 John Wiley & Sons, Ltd.