No rejection symptoms after a leukemia transplant is not necessarily a good thing. Leukemia patients with no rejection symptoms after transplantation can be divided into two situations, one is that the new bone marrow after transplantation has not functioned, and the other is that the donor bone marrow has fused with the recipient. 1. The new bone marrow does not work: in this case, it may affect the normal therapeutic effect, so the patient should undergo regular review in order to identify the cause for targeted treatment. 2. The new bone marrow has fused with the recipient: this situation should be a good phenomenon, indicating that the new bone marrow has fused with the patient and started to play its role, which can rebuild the hematopoietic function and thus achieve the therapeutic purpose. Therefore, no rejection symptoms after leukemia transplantation should be treated differently according to the specific situation, and it is better to actively review and follow up, and carry out effective treatment under the guidance of the doctor, so as not to cause other adverse reactions.