Hi what are the checks and symptoms for cervical erosion

It's not uncommon or dangerous.
If there is discharge or bleeding, have a doctor check it out to verify if it is just normal cervical ectropion or cancer.

Why do you ask? Did someone suggest that you or someone you know might have it?. and that you should be concerned?

As with any potentially threatening medical issue, consult a doctor who can examine you personally, and have access to your history.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3031439/

Perhaps this is a homework question.