文章介绍了人工影响天气（人工增雨、防雹、消雾等）的基本科学原理、国内外的发展历史、现状、科技水平、效益以及国内的需求、组织、规模等概况。描述了我国典型的人工影响天气工程系统及其各组成部分，即天气云况监测预测、催化技术、数值模拟、通信指挥和效果评估等分系统。强调了科研支持系统的重要性，提出了当前有关应用基础和技术开发的主要研究课题，阐述了长期稳定的科学示范试验的重要作用以及本领域的今后开拓方向。

Weather modification (rain enhancement, hail suppression, fog clearing, etc.) is introduced in this paper, including the basic scientific principle, history of development, present status, scientific-technical progress, scope of activities, increasing demand, organization, etc. , in China and abroad. A typical operational system of weather modification in China is described, which consists of monitoring and forecasting of weather and cloud, seeding technology (conception model, seeding criteria, effective agent, delivery system) ,numerical modeling, communication-commanding and evaluating systems. The importance of scientific-technical research system is emphasized. The main aspects of research on the concerned applied sciences and technical development are proposed. The important role of long-term stable scientific demonstrative experiments is explained. The direction of further development in this field is also suggested.