Busemann Function, The Second Class To Implement A Typical Domain

This paper gived out the Busemann function on RRII and proofed the following theorems :(I)to one arbitrary geodesies acrossing zero on RRII:then the Busemann function dertermined by r(s) is:in them dkk is the main diagonal element of (I-T)-l(I+T). (II)to one arbitrary geodesies acrossing zero on RRII.then the Busemann function dertermined by r(s) is:ak log dkk in them satisfy:this paper is divided into three parts.the fist one is preparation,gived out the define of the Busemannfunction;the geodesies acrossing zero and Athe second part gived out and verified some theorems.the other gived out the define of "two lines is geodesies eachother".The three part gived out import conclusion (gived in front).