This paper reports a new bifurcation pattern observed in a Lorenz-type system. The pattern is composed of a main bifurcation route to chaos ( n = 1 ) and a sequence of sub-bifurcation routes with n = 3 , 4 , 5 , … , 14 isolated sub-branches to chaos. When n is odd, the n isolated sub-branches are from a period- n limit cycle, followed by twin period- n limit cycles via a pitchfork bifurcation, twin chaotic attractors via period-doubling bifurcations, and a symmetric chaotic attractor via boundary crisis. When n is even, the n isolated sub-branches are from twin period- n / 2 limit cycles, which become twin chaotic attractors via period-doubling bifurcations. The paper also shows that the main route and the sub-routes can coexist peacefully by studying basins of attraction.