The purpose of this study is to examine the validity of groove in enhancing performance of splicing fiber in air splicer. A groove is usually used to improve the condition of internal flow, reduce the internal pressure and so on. In this paper, a two-parameter numerical mathematic model was developed and calculated in two configurations (chamber with groove and chamber without groove). The strength of the fibers was measured which were got from the air splicer with two different configuration. The result of simulation and experimental shows that: with the increase of inlet pressure, the rotational velocity and axial velocity of air flow also increase for the without groove case. As a counterpart, the axial velocity can be significantly reduced while rotational velocity keeps constantly for the groove case.