After hypoxia preconditioning (0.1–0.3% O2), transplanted MSCs migrate into peri‐injury regions in the intracerebral haemorrhagic stroke brain and promote neurogenesis and neurological functional recovery through secreting various growth factors, including brain‐derived neurotrophic factor (BDNF), glial cell line‐derived neurotrophic factor (GDNF) and VEGF 40. Here, BDNF is linked to hemorrhagic stroke.