Function division, one culturing dish can finish three steps, make the test process more convenient while space is used effectively. Put the ovum complex which obtained from the ovum picking dish into the big grids of multi-purpose culturing dish, picking up the ovum again, and put into the two small grids to wash step by step. After washing, transfer the ovum into the big grids of the second multi-purpose culturing dish to get fertilized. After that, put into the two small grids to get rid of the external connected granular cells.