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Distributed Video Coding (DVC) is well known for low complexity encoding which provides coding solutions for a wide range of applications, in particular wireless video surveillance. In this paper, we address the problem of distortion variation introduced by typical rate control algorithms, especially in a various bit rate environment. A distortion quantization model derived from a MPEG-2 distortion estimation model is proposed to achieve smooth picture quality across video frames. Simulation results show that the proposed quality control algorithm is capable to meet user defined target distortion and maintain a rather small variation for sequence with slow motion and performs similar to fixed quantization for fast motion sequence at the cost of some RD performance.