To verify the feasibility of an ambiguity resolution method for Beidou bi-satellite orientation by extending baseline, an experimental platform was established by using a Beidou carrier phase receiver with two-antennas. A physical experiment scheme was proposed for the extending baseline, which was realized by determining different positions of several antennae with different baseline lengths in the same direction in advance. The results show that it is feasible to determine the ambiguity of a Beidou single difference carrier phase by extending baseline, and the success rate can reach 100% without cycle slips during extending baseline. Moreover, some deterministic factors such as baseline length, orientation duration, and baseline direction on Beidou orientation were verified by the way. It suggests that the baseline length and orientation duration should be prolonged, and the baseline direction should be as near south-north as possible in order to improve the orientation precision. The research work will greatly improve the practical engineering application of Beidou orientation technology.