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Windows 10 starts normally then shutdown promptly when the desktop appears first time. The shut down process is like normal shutdown process,just like when we click shutdown from the start menu. After shut down the ,when I turn on the laptop for second time the problem not apppears.

You are facing unexpected shutdown after booting the laptop. This might be due to the issues regarding power management. I would like to suggest you to try running the Power Troubleshooter to check if it helps to resolve the issue. Have in mind to back up your data from system partition before the process commences, as unexpectedly shut down may lead to data loss. Way 1: Run the Power troubleshooter on the system. Refer these steps: Press Windows key + X, select Control panel.Change the view by option on the top right to Large iconsClick on troubleshooting and click on the view all option on the left panelRun the Power troubleshooter Way 2: Further you can try creating a new power plan according to your preference. Refer the link below for more details on Power Plans. Power Plans: frequently asked questions http://windows.microsoft.com/en-us/windo… (Steps in the article, applies to Windows 10). Way 3: Perform a Clean boot and check if it helps. Perform a clean boot to check if any third party application is causing the issue, as clean boot helps in eliminating software conflicts. How to troubleshoot problem by performing clean boot in Windows: https://support.microsoft.com/en-us/kb/9… Note:  Refer “How to reset the computer to start normally after clean boot troubleshooting” to reset the computer to start as normal after troubleshooting. Also check the Event Viewer logs at the time of the shutdown. Refer the link below for steps to access the Event Viewer on Windows 10. http://answers.microsoft.com/en-us/windo… Hope this information is helpful.