本美术片为木偶片，根据萧干牛整理的侗族民间传说故事改编，黄永玉、玉昌诚任美术设计。 很久以前，陡高山下某个寨子的人们过着缺水少粮的贫困生活，他们吃水靠天，吃粮靠野草和树皮。有一头乌黑长发的长发妹是位善良的姑娘，她见老榕树已近枯死，便将好不容易才收集到的水分给它喝。某天，长发妹在陡高山上看到一个大萝卜时，欣喜地将它拔下，不想流出甘甜纯净的泉水，这时，山妖出现，威胁她不准将山上有泉水的秘密说出，否则要她和全寨子人的性命，陷入痛苦中的长发妹一头乌丝逐渐变得枯黄、灰白。最终，她决定将秘密告诉受难的乡亲，就在山妖要取她性命之时，曾被她救助过的老榕树化身神仙及时现身。
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