Test scheduling will reduce testing time and decrease testing cost. As many IP cores as possible can be tested in parallel by scheduling. But too many parallel tests will lead to over power and do harm to the SOC. To solve the problem, an IP cores test scheduling optimization method based on genetic algorithm is proposed. Searching for the shortest test time under considering power constrain. The experiment results of an ISCAS circuit based SOC verify the good optimization effect of the method, achieves reliability and economic for IP cores test scheduling.