Combining RAGA with multi objection planning, the author solved the problem of optimizing many parameters at the same time. Thus, the advanced convergence and easily to run into partial optimization have been handled. Based on RAGA, the author applied the multi objection planning model to soil and water conservation of small watershed named Xinglong in Songnen plain. The result is good, and the paper can provide a new method for readers who engaged in correlative research.