Objectives: Study on characteristics of chromosomal abnormalities and evaluate the relationship with the early result of treatment according to FRALLE 2000 protocol at the National Institute of Hematology and Blood Transfusion. Subjects and research methods: This was a prospective study conducted on 188 pediatric ALL patients who were treated at the National Institute of Hematology and Blood Transfusion from August 1, 2016 to August 1, 2019.