Hello everyone . I deleted project but subtask still shows my task and new task . also cellphone screen shows too much subtask which I deleted project .
Hi @Frank_wu! As it stands, subtasks to not inherit the project of their parent task (How to Create and Use Custom Fields in Asana | Product Guide • Asana Product Guide), so you have to manually associate them to the project in question for them to belong to the project.
From what I understand with all the info you gave us, your subtasks were not associated with the project before you deleted the project itself. This explains why all tasks have been deleted but subtasks are remaining in your My Tasks.
If you want to quickly delete these subtasks, simply multi select them (Task actions: create, move, duplicate, and more | Product guide • Asana Product Guide) to delete them all at once.
Hope that helps; let us know if you have any follow-up questions! 
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