In order to solve the problems laid on continuous signal sampling based on finite rate of innovationm, the feature of piecewise linear sequences is studied seriously, and a method called sequence resampling is proposed where the continuous signal variation parameters is extracted in discrete domain. The finite rate of innovation of sequence with finite length is defined, and a parameter extract method called test method is concluded which is suitable for the parameter extract of simple linear sequences, then this method is extended to the one of normal linear sequences. The innovation number does not need to be known in advance, and complex operations in continuous domain can be avoided; the signal′s innovation time and parameters can be extracted from the sampled sequence, and the signal sampling is realized. The proposed algorithm is simulated, and the results show that the proposed algorithm is valid.