  The modified model emission function S(x,p), with a uniform radial expansion
mode and mass reduction, is used to study the single particle spectra and two
particle correlation of pions. The calculated HBT radii and one particle
spectra are compared with the data from $\sqrt(S_NN)$=130 GeV Au+Au collisions
at the Relativistic Heavy Ion Collider (RHIC). We see the main features of the
data are reproduced, Ro/Rs decreases with increasing Kt and we have a kinetic
freeze out temperature T=150 MeV.
