If you're putting it over a vinyl composition tile (VCT), you should be fine. If you're putting it over ceramic tile, it will not work. The laminate will shift and flex when you walk over it, which will cause it to break and come apart. If there is ceramic, you must remove it first.
When placing laminate over tile thoroughly clean the surface of the tile to ensure the best possible adhesion. Smooth over the laminate to remove any air pockets afterward.
Before putting laminate down make sure that your floor is completely free of left over cement and left over glue. This will ensure that the laminate will lay cleanly.