Strengthening enterprise capital operation budget is the basic requirement of China's socialist market economic system, and also the need of the development of the times. In the process of the company 's growth, budget management is an inseparable part. Doing a good job in the company 's capital budget can effectively ensure the effectiveness of its decision-making, maximize the utilization efficiency of operating costs, and then contribute to the company 's sustainable operation. With the continuous growth of China 's national economy, the budget system of China's state-owned capital and private enterprises is becoming more and more perfect. Based on the basic definition of China 's state-owned capital operation and private enterprise capital budget, this paper studies the problems faced in the capital budget system and management mechanism, and on this basis, puts forward the application of strengthening the market mechanism in the construction process of China's private enterprise capital budget system and management mechanism, emphasizing the reform of enterprise management concept and improving enterprise management ability. Finally, combined with the background of the new coronavirus epidemic, the corresponding countermeasures and suggestions are put forward for the optimization of enterprise financing channels and capital budget.