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Utilizing the complexity and good pseudorandom property of the spatiotemporal chaotic system, a novel image encryption algorithm is proposed. The plain-image block data is masked by the values extracted from the spatiotemporal chaotic system. Then the masked data is shuffled according to the maximum state value in the system. A cipher block chaining (CBC) mode is employed to adjust the state value of the spatiotemporal chaotic system, which makes the orbits of the spatiotemporal chaotic system depend on the plain-image as well as the initial state values. It further improves the security of the algorithm. Theoretical analysis and computer simulations both show that the proposed algorithm has good security for practical image encryption.