Objective To study the effect of intracranial pressure (ICP) monitoring combined with floating bone flap decompression on intracranial pressure and cerebral blood flow index in the treatment of craniocerebral injury. Methods A total of 106 patients admitted to our hospital from March 2019 to March 2021 were selected as study subjects and divided into control group (n=53) and observation group (n=53).The control group was treated with traditional decompressed craniectomy (DC), and the observation group was treated with ICP monitoring combined with floating bone flap decompression.The ICP, cerebral blood flow index [mean flow velocity (Vm), systolic flow velocity (Vs), vascular pulsatility index (PI)] and complications were compared between the two groups. Results ICP and PI were lower in observation groups on 1,3 and 7 d, Vm and Vs were higher (P <0.05); the incidences of complications in observation group (9.43%), such as electrolyte disorder, pulmonary infection, abnormal renal function and incisional hernia, were lower in the control group (37.74%, P<0.05). Conclusions ICP monitoring combined with floating bone flap decompression could reduce ICP, improve cerebral blood flow, reduce postoperative complications, avoid secondary surgery and reduce economic burden.