With the arrival of knowledge economy, private high-tech enterprises have mushroomed to meet the rise and developed rapidly. Private high-tech enterprises are the main force of scientific and technological innovation. It plays a vital role in the economic development of countries and regions. However, the small scale and high risk of private high-tech enterprises determine that private high-tech enterprises have many inherent shortcomings. Main features: firstly, private high-tech enterprises are generally small in scale, and the output of raw materials and products used is relatively small, resulting in higher production costs; Secondly, due to the limited strength of private high-tech enterprises, it is difficult to establish effective distribution channels; Thirdly, because more managers are technical, the restriction of management concept is also a major factor hindering the development of enterprises. Because M&A provides the enterprise with the power of continuous growth, and M&A will be one of the eternal themes in the enterprise life cycle, so M&A will often bring the greatest long-term return to the enterprise.

The text is divided into five chapters. The first part summarizes the significance of the research on the synergy effect of private enterprise mergers and acquisitions, as well as related aspects at home and abroad. The second chapter defines the private high-tech enterprises theoretically, and puts forward the concepts of merger and acquisition synergy and capital synergy. The third chapter follows the theoretical research results of M&A synergy of private high-tech enterprises, and analyzes the management synergy, management synergy, financial synergy, intangible assets synergy and industrial synergy. The fourth chapter points out that the main problem existing in the synergy of private high-tech enterprises' mergers and acquisitions is that the relationship between the synergy of mergers and acquisitions and many external factors is not handled well. The fifth chapter puts forward some suggestions to improve the synergy of private high-tech enterprises' mergers and acquisitions.