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This study addresses a robust H∞ filtering design problem for linear stochastic partial differential systems (LSPDSs) with external disturbance and measurement noise in the spatio-temporal domain. For LSPDSs, the robust H∞ filter design via a set of sensor measurements needs to solve a complex Hamilton Jacobi integral inequality (HJII) for robust state estimation despite external disturbance and measurement noise. In order to simplify the design procedure, a stochastic spatial state space model is developed to represent the stochastic partial differential system via the semi-discretization finite difference scheme and the Kronecker product. Then based on this model a robust H∞ filter design is proposed to achieve the robust state estimation via solving the linear matrix inequality (LMI). The proposed robust H∞ filter has an efficient ability to attenuate the effect of spatio-temporal external disturbance and measurement noise on the state estimation of LSPDSs from the area energy point of view. Finally, a robust H∞ state estimation example is given for the illustration of design procedure and the performance confirmation of the proposed robust filter design method.