The orthogonal multi-matching pursuit （OMMP） is a natural extension of the orthogo- nal matching pursuit （OMP）. We denote the OMMP with the parameter M as OMMP（M） where M ≥ 1 is an integer. The main difference between OMP and OMMP（M） is that OMMP（M） selects M atoms per iteration, while OMP only adds one atom to the op- timal atom set. In this paper, we study the performance of orthogonal multi-matching pursuit under RIP. In particular, we show that, when the measurement matrix A satisfies （25s, 1/10）-RIP, OMMP（M0） with M0 = 12 can recover s-sparse signals within s itera- tions. We furthermore prove that OMMP（M） can recover s-sparse signals within O（s/M） iterations for a large class of M.
