what is meant by Page CTR Page eCPM in google adsense. these thinks should be high are low in my account.

CTR = Click Throughs / Impressions 

Page eCPM is calculated by 

eCPM = Total Earnings / impressions in thousands 

You want both of these metrics high. The higher the better -- though be careful of very high CTR as that can be a sign that there's something fishy with the account 

eCPM is important to keep high. It tells you the earning capability of your page from advertising. Even if your traffic is low but the eCPM is high, you can still earn huge from Adsense.