Positive prescription is one form of prescription system, which means title to property may be acquired by a person who has no title to it originally after he possesses it and for a period of limitation continuously. 取得时效是时效制度的一种,是指无权利人以行使某权利的意思而持续地行使该权利,经过一定时期后,遂取得该权利的制度。