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With the rapid development of trenchless technology, measurement-while-drilling systems draw extensive attention. At present, measurement-while-drilling systems are generally based on magnetic surveying technology or single-accelerometer measurement. In that case, the accuracies of these measurement-while-drilling systems are limited. In this article, a new measurement-while-drilling system with redundant accelerometers based on inertial technology is presented to improve the measuring performance of attitude, especially the measuring accuracy of roll. To reflect the influence of electromagnetic interference, the credibility estimation could be got by comparing the same attitude angles from the accelerometer and magnetometer. The calculation algorithm and experimental data are given in this article. Compared with traditional measurement-while-drilling systems, this new measurement-while-drilling system obtains better anti-disturbance property, higher measuring accuracy, and more reliable calculated results.