Two novel methods for generating spatiotemporal chaotic pseudorandom-bit sequences (PRBS) based on the one way coupled map lattices (OCML) model are proposed. In the first one，the symbolic sequences are generated by a partition，which is based on the statistic property of the state of the one way coupled map lattice. And in the other，the sequences are obtained by comparing the two consecutive state values of a single lattice of the OCML. We compareed the performance of these two types of sequences with the conventional ones. The numerical experiments demonstrated that the sequences have ideal randomicity, excellent correlation and run-length distribution，and they are good candidates for information security，cryptography and spread-spectrum communications.