In order to avoid the trachoma of porosity in aluminum die casting process, the following points are summarized.

1. Ensure the quality of degassing in aluminum alloy smelting, a good degassing agent to reduce the air content in aluminum water, timely remove the liquid level scum, bubble other oxides, prevent the gas entering the die casting again;

2, choose a good demoulding agent, the chosen demoulding agent should be in the die casting does produce gas, has good demoulding performance;

3. Ensure that the mold's exhaust is unobblocked smooth; ensure that the mold's gas is completely discharged, especially at the final aggregation of aluminum water, the exhaust channel must be unobblocked;

4. Adjust the die casting parameters, the filling speed shall be too fast to prevent air entrapment;

5. In product design mold design, attention should be paid to core-pulling cooling to minimize the shortcomings of excessive wall difference;

6. The air holes that often appear in the fixed part should be improved the mold design.