Despite a high prevalence of hypertension in diabetes and close relationship between primary aldosteronism (PA) and glucose metabolism, few study concerns the prevalence of PA in diabetes with hypertension.This study aimed to detect the prevalence of PA in patients with new-onset type 2 diabetes (T2D) and hypertension and to explore the association between PA and diabetes.A total of 256 outpatients with new-onset T2D and hypertension were screened for PA. Plasma aldosterone concentration (PAC), plasma renin activity (PRA) were measured. Patients with an aldosterone renin activity ratio (ARR) 30 ng/dL/ng/mL/h and PAC 15 ng/dL underwent confirmatory captopril challenge test (CCT) for PA. The diagnostic criteria for PA were, after CCT, (1) PAC decreased < 30%, (2) ARR maintained 30 ng/dL/ng/mL/h, and (3) PAC was 11 ng/dL.Of 256 consecutive patients, 99 (39%) were positive for the screening test, and 49 (19%) were diagnosed with PA. Compared with those in groups A (screening test -) and B (screening test +, CCT -), patients in group C (diagnosed with PA) had a higher percentage of systolic blood pressure of 160 mmHg, less family history of hypertension, and lower serum potassium. Patients in group B and C had higher PAC and ARR levels, but lower PRA than those in group A. Homeostatic model assessment for insulin resistance (HOMA-IR) was positively associated with PAC level among the diabetic patients.The prevalence of PA in new-onset T2D patients with hypertension is at least 19%. Higher aldosterone may be related with insulin resistance in patients with diabetes.