1. There are two reasons inducing thin pores crassitude:First, thin pores is generally in the shape of open. Second, thin pores is blocked by cutin and dirt.

2. Ppy-calcium phosphate coating was ordered array, needle shape and'coating grain was crassitude.

3. At the same time, it improves bad conditions. eg. black skin, yellow skin and pore crassitude to make it immaculate and feel larruping.

4. Results: Umbilical cord mild infection rate is related with the cut of umbilical cord with residual, the high ligation of the umbilical cord and the umbilical cord with congenital crassitude.

5. The article discusses causes and eliminated measures of aluminium alloy die forgings crassitude crystal from four sides of component, technical parameter, temper of die and heat treatment.

6. Although PM has solved the problem of carbide segregation and crassitude fundamentally, it has complicated technics and extortionate cost, so restricts its application.