For improving reliability and operating speed of game and mutual application, taking Verlet integration as core, present an iterated algorithm. Introduce plans for penalty and improvement, solving consistency problems with relaxation methods, cloth simulation software process to realize process and effect picture, pictures showing the procedure and test result. The method is verified by test. Result shows that the algorithm can end in any time, it can effectively exchange precision for time. This method is much faster than other methods in circumstances like simulating cloth in games which does not need high precision.