Hi Shuairong, as this question pertains to access and permissions, I am raising a support ticket for you via email, as they are the team able to address such problems. 

To others who have the same or similar questions:

To be eligible for the Education & Research (E&R) program, you must register with your institution email. Any other email may be used for the other programs. Check out Get Started with Planet to see a full list of programs Planet offers.
For any account related questions, please contact support by emailing support@planet.com.