Ricci flow on compact Kähler manifolds of positive bisectional

where ω̃ = ( √ −1/2)g̃ij̄dz ∧ dz and Σ̃ = ( √ −1/2)R̃ij̄dz ∧ dz are the Kähler form, the Ricci form of the metric g̃ respectively, while c1(M) denotes the first Chern class. Under the normalized initial condition (2), the first author [3] (see also Proposition 1.1 in [4]) showed that the solution g(x, t) = ∑ gij̄(x, t)dz dz to the normalized flow (1) exists for all time. Furthermore by the work of Mok [11] (and Bando [1] for n = 3), the solution metric g(x, t) is known to have positive bisectional curvature for any t > 0. Our main result is on the uniform estimate of the curvature independent of t: