The economic benefits of the precision casting differences mainly comes from these aspects.We should do more provinces, also should concern to other aspects.The casting effect by different casting methods are not the same.We can for each kind of method produced by the product comparison, to determine the economic efficiency is high and low.Precision casting technology can bring us more high economic benefit, we can see from several aspects.Such as precision castings, then there is the initial investment and productivity, etc.Economic benefit is not a day two day's achievement, but also needs a process.The selection of the main or casting foundry method.If we use the lost wax casting, casting might have these features: high precision, complex, shape close to the extent to which we want to build, can be used directly.This is a kind of technology progress, is also a kind of method of successful implementation.Low, the bigger the line shrinkage rate.B. common material casting shrinkage rate is as follows: casting shrinkage ratio K = (LM - LJ)/LJ x 100%, LM for the cavity dimension, LJ for casting size.K by the following factors: the wax models K1, K2, alloy casting structure types K3, K4 pouring temperature.