Methods: To adopt a random, double-blind and placebo comparative research.
方法：采用前瞻性随机双盲、安慰剂对照研究。
Methods The multicenter, double-blind, random samples, active-controlled study has been processed in the mild to moderate hypertensive patients, and maleic acid amlodipine as the controll drug.
方法以国产马来酸氨氯地平为对照药，在轻度至中度高血压病人中进行多中心、随机、双盲、平行、活性对照的临床试验。
Methods The multicentre prospective, random, double-blind and imitation, positive-drug parallel control clinical trails are used.
方法采用前瞻性，随机双盲双模拟，阳性药平行对照，多中心临床研究。
Method: the study adopt random and double-blind clinic method. Patients that conform to the condition can be selected.
方法：采用以安慰剂为对照药的临床随机和双盲研究。
Method: the study adopt random and double-blind clinic method. Patients that conform to the condition can be selected.
方法：采用以安慰剂为对照药的临床随机和双盲研究。
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