Cloud computing can well solve the following problems: 1, anytime and anywhere to achieve Internet access cloud computing supports users in any location, any time, using a variety of terminals to obtain application services. In the near future, only a portable computer or a cell phone, you can use network services to achieve everything we need, even including supercomputing such a task. 2, data storage is reliable and secure cloud computing provides a reliable and secure data storage centers, the use of data multicopy fault-tolerant, computing nodes are isomorphic can be interchanged and other measures to ensure the high reliability of the service, the use of cloud computing is more reliable than using the The use of cloud computing is more reliable than the use of local computers, avoiding problems such as data loss or viruses that may be caused by users storing data on personal computers. At the same time, cloud computing supports the sharing of data through a strict rights management policy.3, user-friendly and fast cloud computing era, users will no longer need to use personal computers like buying, installing and upgrading a variety of applications on the computer, only need to have a web browser, you can easily and quickly use a variety of services provided by cloud computing. This will effectively reduce the difficulty of the application of technology, and further promote the development of Web services breadth and depth. 4, powerful computing power cloud refers to a group of computers, each of which includes more than 100,000 computers, or even millions of computers, is the center of the data storage and application services, used to complete the work of the storage and computation, which can provide ordinary users with trillions of times a second or higher computing power, to complete the user various business requirements. It can provide ordinary users with trillions of times per second or higher computing power to fulfill various business requirements of users. This super computing power is difficult to achieve in an ordinary computing environment, but cloud computing can provide network applications with such a powerful computing power.5, on-demand service cloud is a huge pool of resources, the user on-demand purchase (pay); cloud can be billed like water, electricity, gas, billing, charging.6, low price, high efficiency due to the cloud using a special fault-tolerant measures can be used for inexpensive node to Composition of the cloud. Furthermore, the cloud's automated and centralized management model eliminates the need for a large number of enterprises to bear the increasingly high cost of data center management. In addition, the versatility of the cloud allows for a significant increase in resource utilization compared to traditional systems. As a result, the cost of using the cloud is much lower than before, users may only need to spend a few hundred dollars, a few days to complete the previous need for tens of thousands of dollars, months to complete the task. 7, conducive to the supervision and control of the server client system like any other, the most significant advantage of cloud computing is the centralized management advantage. Centralized management facilitates regulation and control of the entire system. It is true that the possibility of the cloud itself being attacked exists, but this cannot be avoided with any kind of system or computing model. And, since the customer's applications and data reside in the cloud, the customer's information is safe as long as the cloud is protected. Because the cloud is relatively centralized, measures such as finding vulnerabilities and monitoring for attacks are more effective to implement. Although thin clients have similar advantages, but the cloud is faster than a thin client, and other aspects of the advantages are more obvious.8, storage data is more secure The centralized management advantages of cloud computing is also reflected in the data storage. As the data is stored within the cloud. The level of protection, backup and recovery of the cloud is much higher than that of a personal computer, or other terminals. Moreover, due to the nature of cloud computing, applications can be launched over the network from any location, which avoids the need to copy data to mobile storage media (portable computers, USB flash drives, removable hard disks), thus eliminating the resulting leakage of sensitive data. In addition, the intermediate data required in the computing process based on the application can be generated, used and eliminated within the cloud, do not need to be transmitted through the network between the terminal and the server, the need to transmit the data is only required by the terminal, which reduces the intermediate data in the network to transmit the data leakage risk arising from the data leakage.9, shorten the crisis recovery time cloud computing improves the ability of the application to respond to the crisis. The first task after a crisis is to restore services. Cloud computing is particularly good at this. When an instance of an application within the cloud is not working properly for external reasons, a new instance can be started immediately. This greatly reduces the time to recover from a crisis.10. Backups are simple and fast because the replication action within the cloud is very fast and efficient. Make the cloud backup work becomes relatively simple and efficient. The user (or the user's application) only need to issue a command, the backup action can be completed in the cloud, and there is no need to transfer the backup data through the network. 11, efficient logging Since the cloud's own architecture has been made logging, the application only needs to pay attention to their own logs. This avoids generating a lot of redundant information to be written to the logs. Simple and clear logs, conducive to finding system vulnerabilities, monitoring the work of the software. 12, timely update vulnerability patches due to the application instance of the operating environment will be updated with the cloud update, so the application security has also been synchronized to improve. 13, open-source software to reduce backdoor vulnerabilities in the architecture of cloud computing a large number of open-source software applications. This eliminates attempts by certain organizations and individual businesses to insert backdoors into the software. The open source code also allows programmers to customize the software for specific needs. For example, if an organization needs additional encryption for sensitive data, it can build on the open source software to meet the need. This customization, in the current large number of commercial software (non-open source) computing environment is impossible to achieve.14, the continuous improvement of browser security cloud computing also has to be improved. How to improve browser security is the main problem. For mobility reasons, most instances of cloud computing applications are browser-based applications. Thus, the security of the browser directly affects the security of the cloud computing system. As browser-based applications are becoming more widespread, browser security has been greatly improved in recent years.