In　this　paper,　we　study　the　permanence　of　the　following　periodic　Holling　type　predator-prey　system　with　stage　structure　for　prey　x(1)(t)　=　a(t)x(2)(t)　-　b(t)x(1)(t)　-　d(t)x(1)(2)(t)　-　e(t)x(1)(y)(t)/p(t)+x(1)(y)(y)　y(t),　x(2)(t)　=　c(t)x(1)(t)　-　f(t)x(2)(2)(t),　y(t)　=　y(t)　(-g(t)　+　h(t)(x)(1)y(t)/p(t)　+　x(1)(y)(t)　-q(t)y(t)　)　Sufficient　and　necessary　condition　which　guarantee　the　predator　and　the　prey　species　to　be　permanent　is　obtained.　Some　new　results　are　obtained.　(c)　2006　Elsevier　Inc.　All　rights　reserved.