Abstract: A certain structure requires high bending resistance, hardness and deflection of alloy cast iron. Comparative experiments were carried out on melting element ratio, pre-control of carbon equivalent and cooling method of Cu gray cast iron. The results show that the strength of alloy cast iron with Cu content of 1.50%-2.00 wt% is improved compared with that of ordinary gray cast iron; when the carbon equivalent is 3.53%, castings with good hardness consistency can be obtained; for bar blank, HTCu1.8 alloy cast iron with high bending strength can be obtained by cooling shell without sand filling and interval cooling after pouring.