The phase diagrams and compensation behaviors of mixed spin-1/2 and spin-1 Blume-Capel model in a trimodal magnetic field are investigated in the framework of the effective field theory on simple cubic lattice. The change of negative crystal field and trimodal concentration can affect the TCP, the second-order phase and the magnetic field degeneration at ground state in T - H space. In T - D space, the trajectory of the TCP takes on the acre curve and there exist the two TCPs under certain condition. In addition to giving one or two compensation temperature points in M - T space, the mixed spin Blume-Capel model also provides one or two novel compensation magnetic field points in M - H space. Some results are not revealed in previous works. © 2007 Elsevier B.V. All rights reserved.
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