By using the rezults of our paper (I), the particle content in de Sitter gravity are explored. It is found that the SO(3, 2) de Sitter gravitational theory is ghost-free and tachyon-free, and the SO (4, 1) theory should be excluded. There are three kinds of particles in SO (3, 2) de Sitter gravity: JP=2+, 1- with m=0, and JP=0+ with m = 21/2L-1, (L is the radius of de Sitter pseudosphere). The spontaneous symmetry breaking of the Minkowski vacuum caused by the cosmological constant is also investigated at the tree level.