慢性中性粒细胞白血病 (chronic neutrophilic leukemia,CNL )是一种骨髓增殖性疾病 ,发病率很低 ,治疗 CNL的报道很少。我们用羟基脲治疗 3例 CNL,取得了较好的疗效。1　临床资料1.1　一般资料　男 1例 ,女 2例 ;年龄 6 4～ 6 6岁 ,平均 6 4.7岁。起病至就诊时间 1周～ 13年 ; Chronic neutrophilic leukemia (CNL) is a myeloproliferative disease with low incidence and few reports on the treatment of CNL. We use hydroxyurea treatment of 3 cases of CNL, and achieved good results. 1 Clinical data 1.1 General Information 1 males and 2 females; aged 6 4 ~ 6 6 years, an average of 6 4.7 years old. From onset to treatment time of 1 week ~ 13 years;