That's a very short question. With a very long answer. The Surrogate's Court Procedure Act [SCPA] governs many of the proceedings in Surrogate's Court, but New York's Civil Practice Law and Rules will govern those matters as to which the SCPA is silent. Substantively, the Estates, Powers, and Trusts Law applies.
If there is specific information that you are seeking, I suggest that you ask your question directly.
Good luck to you.
The surrogates court generally adjudicates the probate of wills, the administration of estates, guardianship proceedings and the like. What specifically is the nature of your inquiry?