Modern medical research has not found direct evidence that formaldehyde can cause leukemia. At present, there are more teams at home and abroad through the mouse test hope to be able to find evidence that formaldehyde can cause leukemia, although some teams in the experiment found in the formaldehyde gas environment in the mouse hematopoietic system and leukemia patients appear similar abnormal changes, confirmed that formaldehyde can lead to the mouse bone marrow hematopoietic system is damaged, but whether it is able to cause leukemia is still no direct evidence. Formaldehyde is a colorless gas with an irritating odor, which is much less common in our lives nowadays after technological improvements, and it can cause a number of irritating effects on the human body, such as on the eye and nasal mucosa. Formaldehyde and leukemia association mechanism has to be further studied, life without excessive worry about its possible carcinogenic effect, attention to prevention in life can be.