Book excerpt: This book focuses on the comprehensive grasp and analysis of the financial data of ZLCs in 2020 and in-depth observations by ZLCA for many years. This book objectively presents the capital market distribution, overall scale, profitability, innovation ability and social contribution of ZLCs from multiple dimensions and carries out thematic analysis and research on the high proportion of accounts receivable to current assets in ZLCs in recent years, aiming at objectively presenting their competitive strength and development status. Whether you are an investor, an economic researcher or the general public interested in Z-Park, this book is an important way for you to understand the latest development of Z-Park and the high-quality listed companies in Z-Park.