In this paper we consider the transitive index set Tn,p for n×n irre-ducible boolean mat rices with period p.(1) We show a gaps in the transitive index set Tn,p.(2) We obtain that if n=pr+s with 0≤s≤P-1 then for r>1,where ω=0 when s=0
else ω=1.(3) We give the transitive index set for symmetric irreducible imprimitive ma-trices STn,2={m|2≤m≤n-1,m is even}.