Abstract: Objective The aim of this study was to investigate red blood cell parameters and prevalence of anemia among children aged 2-＜7 years in Lvyuan District of Changchun.. Methods From January to September in 2017，a total of 7 626 Children from 2 to 7 years old was selected from Changchun Lvyuan Maternal and Child Health Hospital. The blood samples were detected by Sysmex XE-1800 automatic blood cell analyzer. Differences between sex and age for Red blood cell （RBC） count，hemoglobin （HGB），Hematocrit （HCT），Mean Corpuscular Volume （MCV），Mean Corpuscular Hemoglobin （MCH），Mean Corpuscular Hemoglobin Concentration （MCHC），and Red Cell Distribution Width （RDW） were evaluated. Results The total prevalence rate of boys and girls aged 2~＜7 years in Lvyuan District of Changchun was 2.6% （102/3 902），2.3% （85/3 724），respectively. There was sex difference for RBC，HCT，MCV，MCH，MCHC，and RDW.The value of RBC and MCHC was higher in boys than in girls. However，the value of MCV and MCH was higher in girls than in boys. RBC，HGB，HCT，MCV，and MCH showed upward trend with the age growth in boys and girls. Conclusions The prevalence rate of anemia among children aged 2~＜7 years in Lvyuan District of Changchun was low. There are sex and age differences for Red blood cell parameters.

Key words: Red blood cell , （RBC） count Hemoglobin （HGB）, Mean corpuscular volume （MCV）, Anemia Children Prevalence rate