Abstract: Along the Fujian-Guangdong region there are in general 3 sets of tectonic lines. The most striking ones, belonging to the NE-trending Neocathaysian system, represent the principal ranges and valleys. The Ew-trending lines are lesser in number. The Nw-trending ones, poorly known and represented often by fractures, will be briefly discussed in this paper.The NW-trending fractures are numerous in Southeast China, particularly in the coastal areas of Fujian, Guangdong and Guangxi provinces. They are equidistantly apart in a regular pattern, many of them are followed by rivers; some may measure be comparable in size with the Neocathaysian fracture; most of them are vigorously active in recent geological periods.A thorough investigation into the NW-trending fractures may be significant in solving (l)some geological problems not yet resolved theoretically, as well as those frequently met in Southeast China and (2)some practival problems regarding ore searching, delta conservancy and earthquake predition.

摘要： 在闽粤一带沿海地区有三组主要的构造线;其中以北东走向的新华夏系最发育,构成雄伟的平行岭谷。东西向构造在规模和数量上都不如新华夏系,而以断裂为主的北西向构造,却是了解得最少的,是本文讨论的重点。 在福建、广东、广西等省(区)的沿海地区,常见众多有规律、等间距排列的北西向断裂,它们与该地区的许多北西流向的江河有关;有些北西向断裂的规模不亚于新华夏系断裂,绝大多数在挽近地质时期都有强烈的活动。 对北西向断裂的进一步探讨,有助于解决地质科学中某些尚待澄清的问题,随之自然也有助于解决诸如找矿、三角洲整治以及地震预报等实际问题。