  In the context of the superstring theory, we calculate the radiation
amplitude of a general massless closed string from the interaction of two
parallel D$p$-branes. The background field is the constant antisymmetric tensor
$B_{\mu\nu}$, and the branes have been equipped with the different $U(1)$ gauge
fields. For the large distance of the branes, the Kalb-Ramond emission will be
investigated.
