1, the cake is not thoroughly cooked, the cake is relying on the gasification of water to form small air holes to support the body of the cake, the cake in the heating process, if it is not sufficiently heated and thoroughly baked, the water is not gasified, the support is insufficient, and may be retracted after the completion of the good, collapsed.

2, out of the oven did not immediately inverted, if out of the oven, did not immediately inverted, the cake surface and the internal temperature plummeted, there will be collapse. So don't wait too long to take it out after it's done, you should invert it immediately and serve it after it cools down a little.

3, heating time is too long to cause the cake is too dry, in heating the cake, should not be adjusted too long, because if the cake is heated for too long, the moisture will be dissipated, there is a dry situation, resulting in the cake retracted, collapsed, the general cake heating control in the 20-30 minutes can be.