Sustainable agriculture is the mainstream for the agricultural development in 21st century. The theory and practice of modern plant protection are the important parts of sustainable agriculture. It is the main basis to obtain modern theory and technology of plant protection for the development of no public pollution and ecological agriculture in developing countries . With the increasing of the population and the shortage of food and resources in the world the environment for living goes bad in developing countries day by day. So the expanding of modern theory and technology of plant protection is the important way for improving the ecological environment assuring the continuous increasing of food and vegetable production and enhancing the quality and benefits of agricultural crop.
　　State Science and Technology Ministry of China （SSTMC） is a governmental agency that is responsible for the formulation and implementation of national science and technology R&D plans One of its important missions is to strengthen international cooperation with other countries specially with developing countries in science and technology. Since 1989 international technical course/workshop on various subjects have been conducted in China every year under the auspices of SSTMC as a part of its international scientific and technical cooperation program. Two sessions of the International Training Course on the Theory and Technology of Plant Protection for Sustainable Agriculture in 21st Century sponsored by theDepartment of International Cooperation of SSTMC and organized by Shenyang Science and Technology Commission and Shenyang Agricultural University （SAU） have been held in Shenyang P. R. China in 2001 and 2004 respectively. In 2007 the third session will be held in Shenyang. This book is published as teaching material for the training course.