How to communicate with research advisor politely? Which way is good to communicate or deal with my advisor about research issues? writing an email or talking directly with my professor? What would you do if your professor is busy to check your email and also to talk with you in person? Is there any other option to communicate with my professor about the problem easily and politely?

I am a new PhD student and have some issues to deal with my advisor. So my advisor do not respond to my emails I sent him previously till today. I tried also to talk with him in person but he said that he doesn't have time to talk now. What should I do? how long do I have to wait for his respond? What does it mean when a professor is not willing to respond to his student email?
While your post contains quite a few questions, the best answer for the question "How Do I Communicate With An Advisor Politely?" is very closely related to communicating with a boss in any professional situation. Do your best to be polite, yet firm. Email is a good way to contact him if you can not meet him in person, and a reasonable amount of time to wait for a response is anywhere between 24 hours and 3 days. Any longer than this can prove troublesome for a student (you). If he/she does not answer emails within 3 days, I believe you are well within your rights as a student to POLITELY yet firmly ask the question again or visit his/her office. In short, do your best to manage this relationship as you would manage any other professional relationship, while also making sure your needs are met in a timely manner.