Aim To explore the distribution of intracranial artery stenosis in patients with lacuna infarct and cerebral thrombosis. Methods Magnetic resonance angiograghy was used to assess intracranial artery stenosis in 222 patients with lacuna infarct and 228 cerebral thrombosis. Results 112 subjects with intracranial artery stenosis were found in 222 patients with lacuna infarct(50.45%),being composed of 38 subjects with simplex artery stenosis and 74 subjects with complex artery stenosis.The prevalence of intracranial artery stenosis in the patients aged 30 to 44 years,45 to 59 years and 60 years and over was 16.67%,21.43% and 60.12%,respectively.The incidence of intracranial artery stenosis in grade 1,grade 2 and grade 3 and above was 59.82%,30.36% and 9.82%,respectively.The 191 subjects with intracranial artery stenosis were found in 228 patients with cerebral thrombosis(83.77%),being composed of 83 subjects with simplex artery stenosis and 108 subjects with complex artery stenosis.The prevalence of intracranial artery stenosis in the patients aged 30 to 44 years,45 to 59 years and 60 years and over was 42.86%,80.77% and 86.39%,respectively.The incidence of intracranial artery stenosis in grade 1,grade 2 and grade 3 and above was 34.56%,41.36%,24.08%,respectively.The proportion of simplex artery stenosis in anterior circulution was high in the patients aged 30 to 44 years with lacuna infarct and cerebral thrombosis.In contrast,the complex artery stenosis and the posterior circulation artery stenosis was frequently encounted in the patients aged 60 years and over. Conclusion The prevalence of intracranial artery stenosis with cerebral thrombosis was higher than that of lacuna infarct.The intracranial artery stenosis in grade 1 was the most frequently encounted in the patients with lacuna infarct and the stenosis in grade 2 and above was frequently encounted in the patients with cerebral thrombosis.The complex artery stenosis increased with the ages significantly in the patients aged 60 years and over.