1. Misrun is the common defects found in oven door castings process.

2. It was found that surface of the castings is good and defects such as misrun or cold lap were not found.

3. It was analyzed that the causes of the defects of misrun in oven door. The main factor effecting on the small pressure in molten iron was low temperature molten iron.

4. It was analyzed that the causes of the defects of misrun in oven door.

5. Based on analogic theory, hydraulic model was founded to choose the optimum gating system for prevention from casting defects including gas hole and misrun.