In order to reduce computational complexity of multiview video coding, a fast macroblock mode selection algorithm is proposed. On the basis of a detailed analysis of the distribution and rate-distortion features of macroblock modes in joint multiview video model (JMVM), conceptions of macroblock mode correlation and mode aggregative degree are put forward. The analysis of the macroblock mode correlation of the test sequence shows that the optimal mode of the current macroblock is the same as that of the most neighboring macroblocks. The precision of the macroblock mode prediction is explored from the angle of the aggregative degree of the neighboring macroblock regions. In the implementation of the fast algorithm, a threshold formed by the average rate distortion cost of the neighboring macroblocks determines the necessity for full searching all macroblock modes. Experimental results demonstrate that the proposed fast algorithm promotes the encoding speed by 2.43～4.08 times in comparison with JMVM, while the rate distortion performance nearly remains same.