The 5 classes of antihypertensive drugs with potassium-preserving effects are diuretics, ACEIs, ARBs, as follows: 1, diuretics, amiloride, aminopterin, spironolactone; 2, angiotensin-converting enzyme inhibitors, captopril, enalapril, lenopril, fosinopril, etc.; 3, angiotensin II receptor antagonists, valsartan, irbesartan, temisartan, etc. At present, the commonly used antihypertensive drugs are divided into five categories, and each category of antihypertensive drugs has its own characteristics. All the above three categories of antihypertensive drugs can raise patients’ blood potassium in antihypertensive treatment, so individualized treatment principles must be adopted under the doctor’s consultation.