I have 5 users in with full control over the site,But only when I create an item in the list,workflow will be initiated,what could be the solution to solve this issue?
Open SharePoint Designer and Connect to your site. Click on Workflows from the left navigation, and click on your workflow. Workflow information page will open. In the "Settings" area in the right pane, uncheck the "Automatically update the workflow status to the current stage name". This will fix the problem. If that box is checked the workflow cannot be run by the System Account.
I found my answer here.