In the present,I have confused with the problem.Generally,how many poles and zero in LDO IC with bipolar process? which is the dominant pole? and which part do each of them come from? Are they diffrent from with CMOS LDO?thanks very much! Below picture show the block of LDO
I'd say that the poles can be divided into two groups:
-Poles in the opamp: Miller pole and mirror pole (that should be the non-dominant one)
-poles of the LDO: there are those cause by the opamp, the loading of the pass device on the opamp will create another pole, and output capacitance (C0) will add another pole as well.