Systematic investigations and studies have been carried out in the shortenized and densely planted orchards of Henan Province. They cover the studies of main plant diseases and insect pests sorts, main natural enemy sorts, general plant diseases and insect pests harm law and grass-covered orchard natural enemy species changes. We have also done the experiments of installing the oscillating frequency moth-killing lamps, and the experiments of choosing the highly effective, least poisonous, least remaining chemical and biological pesticide. Through the investigations and experiments, we have worked out a set of techniques of the comprehensive prevention and control of plant diseases and elimination of pests, which are suitable for the shortenized and densely, planted apple orchard. After the techniques have been carried out, the harm of plant diseases and insect pests has been reduced by three times. The fruits have been tested to be non-pesticide remaining. And it is economical, ecological and has obvious social profits.