Abstract: In view of the fact that the crack rate of high alloy steel in a factory is relatively high but there is no slow-cooling pit or other slow-cooling measures，the temperature finite element model of 738H plastic mould steel slab produced by slab continuous caster in this factory with the size of 400 mm×2 000 mm×3 000 mm was calculated by using the finite element software ANSYS. A 96h stacking and slow-cooling temperature measurement experiment was carried out on the plastic mould steel slab of the plant，and the results of numerical simulation were checked by the field-measured temperature. Based on the checked finite element model of stacking cooling temperature field，a stacking slow-cooling process suitable for the factory for continuous casting slab was developed，which could solve the problem well of no delay facilities for continuous casting slab，cracks and slow cracks of high alloy steel slab had been prevented effectively，and the qualified rate of crack control of high alloy steel continuous casting slab could be reached 100%.

Key words: stacking and slow-cooling, high alloy steel, continuous casting slab, finite element, model