Objective To research the health equity of infant death in China from 1981 to 2010. Methods Using data from 《China Health Statistics Year book》 about infant death situation and range method, the population attributable risk percentage, concentration index, concentration curve, analysis the correlation between the infant mortality rate and the each province per capita GDP, quantitative analysis of infant death health equity were analyzed between the provinces in our country. Results The correlation coefficient between province's per capita GDP and infant mortality were relevance had increased.All concentration indexes were negative and concentration curve were above standard, which indicated infant mortality in poor provinces was negative from 1981 to 2010, and higher than in rich provinces. Conclusions The relationship between infant mortality and social economic level take on significant negative correlation and the correlation show a trend of increase.Although the health inequity in infant mortality has been improved, but not obvious.