Abstract: Multiple accumulated-crossover parallel concatenated SPC (M-ACPC-SPC) codes is a class of novel error-correcting codes with low encoding/decoding complexity and good bit-error-rate (BER) performance. The average input-redundancy weight enumerating function (IRWEF) of M-ACPC-SPC codes is deduced to evaluate an upper BER bound of M-ACPC-SPC codes. An approximate formula of BER at high SNR is proposed for analyzing M-ACPC-SPC codes. Analysis show that the error floors of M-ACPC-SPC codes decrease as the growth of interleaver length and the number of interleavers.