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In order to meet the requirements of Synchronous image acquisition in online industrial vision inspection,a new method based on image feature recognition is proposed.According to the method,the spatial characteristic information of sequence images has been calculated,and an algorithm under multi-constrained conditions which based on the trend of feature values of sequence images is established.The synchronous target image in online inspection is acquired by the trigger signal which was obtained by the algorithm under the condition of no dependence on external attachment.The method does not need to rely on the external position feedback device,and reduces the hardware cost.The algorithm has a better synchronization precision and adaptability,and has been successfully applied in practice.