According to the problem that traditional computer intelligent composing objective evaluation is not accurate, the difficulty is too big, this paper on intelligent composition discusses and gives a genetic algorithm intelligent composing model, and puts forward a simplified genetic algorithm based intelligent composing model. For the model from two aspects of algorithm design and realization of the algorithm is discussed, and the program is given out. The experimental results show that the model to improve the local without affecting other parts, has high scalability, the algorithm's time and space complexity is better, proves that this algorithm is feasible and effective.