Some lib include Export Class,i use dependency tool to view this lib,how to know function's define

sample:?Polaris_Measure@CCBjxguance@@QAA_NPBG0@Z 
i know CCBjxguance is export class,Polaris_Measure is class's function,@@QAA_NPBG0@Z  is params and return value,but @@QAA_NPBG0@Z mean ？ which data type ？

So I take it that you have a .dll file but you do not have headers for it? Then finding out the params and return type won't help you much anyway.
That's a member function, to be able to use it you need an instance of that class. And to obtain an instance of that class you need to know the full definition of that class, including its member variables. Member variables aren't exported so you have no
way of knowing those, short of reverse engineering the .dll code.
Anyway, the full declaration of that function is:
public: bool __cdecl CCBjxguance::Polaris_Measure(unsigned short const *,unsigned short const *)
This can be obtained by using the undname utility from a VS command prompt:
undname "?Polaris_Measure@CCBjxguance@@QAA_NPBG0@Z"

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