Research of robust watermarking algorithms is one of the major branches in digital rights management (DRM) systems. It is generally agreed that the quality of watermarked contents, the survivability of extracted watermark, and the number of bits embedded, need to be considered to evaluate how well the algorithm and hence the system is. However, these three metrics conflict with each other. Some previous works aimed at finding the tradeoff between quality and survivability by fixing embedded bits a constant. Besides quality and survivability, we take the number of embedded bits into account. With genetic algorithm, we designed an improved watermarking system that will obtain the reasonable quality, acceptable survivability, and practical capacity. Simulation results present the practical implementation of the proposed algorithm.