This is similar to the question posed here ...

https://www.researchgate.net/post/How_do_I_analyze_the_XPS_valence_band_spectra

A literature search can also provide you with an abundance of links to journals and books that document how to do what you want in a general way. With due respect to all of this, a request for this forum to give you the "simple and facile" answers (i.e. do your homework assignment for you) is a bit bold.

Respected Prof. Jeffrey J Weimer,

I am beginner  in the field of research and my area is photocatalysis 

I have tried these links from researchgate but could not get useful info and then posted my question here

I hope you can understand my problem

Thanks and regards

For normal MgKa XPS you have to take the spectra with low pass energy until you obtain a really good S/R ratio. The resolution will be in the range of .8 eV, which means the valenceband edge will be a convolution of the resolution and the DOS. In addition in most cases you will have contributions of Ti3+ defects in the band gap. To check this take Ti 2p spectra with good resolution and S/R and check for shoulders at the low bindig enegy side. Be shure to take care for the X-ray sattelites stemming from the 2p1/2. As a rough guide fit a straight line into the top of the valence band and look where it intersects with the baseline. You can try to subtract the sattelite spectrum from your X-ray source to obtain a better baseline. Take the spectra well beyond Ef.

@ Prof Dr. Christian Pettenkofer, 

Thank you sir