taoCMS is a CMS system developed based on php+sqlite environment. It uses a streamlined ease template engine and its data reading speed exceeds any cms based on mysql under the same conditions. The code is simple and small in size. All css and JavaScript are handwritten codes, and there is no useless junk code. Strict data filtering is adopted to ensure the security of the server software. The code is completely open source and follows the GPL open source code agreement. taoCMS2.1 is released with improved functions and multiple bug fixes: 1. Add an installation program to automatically determine directory file permissions, making the program more flexible and lightweight; 2. Add template setting function (place the template folder under the template directory to automatically identify it and set it in the background); 3. Repair the deformation of the background friendly link editing page; 4. Streamline the code and redundant files. The size does not increase but decreases. It is 162Kb before compression and 83.5Kb after compression! ; 5. Fixed the problem that the management folder does not take effect after being modified (modified template); 6. Fixed the issue of login box deformation; 7. The column cache is automatically updated after the column is changed; 8. Pagination of the background comment management page; 9. Add data backup function in the background;