This paper introduces a new method of thermal analysis to determine composition of greyiron

which uses ordinary sample cups

the time of primary grain the time-plate from primary grain platform to eutectic and eutectic

the temperature differencebetween primary grain and eutectic and of cooling velocity are measured to determinedinstead of direct determination of TL’

TE’ to definite the chemical composition of grey iron.Not only the temperature pouring and condition cooling are considered

but also theinaccuracy of temperature measurment is avoided

the reliability and praticality of thermalanalysis is improved.The several mathematical models of CEV

C%

Si% are established.