Objective:To investigate the reference intervals of serum Kalium ion(K+),Natrium ion(Na+),Chlorine ion(Cl-),total cal-cium(TCa),total carbon dioxide (TCO2),fasting blood glucose(FBG) and C-reactive protein(CRP) among healthy preschool children(aged from 3 to 6 years) by dry chemical system in Shenzhen. Methods:Stratified randomized cluster sampling method was used to select children aged from 3 to 6 years and 839 healthy children were selected for intravenous blood extraction. Serum K+,Na+,Cl-,TCa,TCO2,FBG and CRP in venous blood were detected by the VITROS 350 system and the data were analyzed by statistical meth-ods. Results:Reference intervals of serum K+,Na+,Cl-,TCa,TCO2,FBG and CRP were respectively 3.8-4.9,136-146,102-110,2.29-2.63,20-28,4.0-6.1 mmol/L and 0-7 mg/L. Conclusions:Reference intervals of serum K+,Na+,Cl-,TCa,TCO2,FBG and CRP are established by dry chemical system among healthy preschool children in Shenzhen. It can provide better references for clinical di-agnosis and treatment.