Objective To approach the expression and significance of CD30 in Hodgkin lymphoma cells which were transfected with mtr Ⅱ gene. Methods The CD30 expression of Hodgkin lymphoma cells in those transfected with mtr Ⅱ gene was analysed by immunohistochemical technique respectively. Results The CD30 expression rate of Hodgkin lymphoma cells which were transfected with mtr Ⅱ gene was higher than that of Hodgkin lymphoma cells which weren't transfected with mtrⅡ gene (P <0.01). Conclusion The mtr Ⅱ gene may be related to the malignant transformation of Hodgkin lymphoma.