Replicating and benchmarking are important step in applying indesing strategy whereas method used to measure performance of replicating index to its benchmark as tracking error, error tracking defined as volaitility of difference of return between replicating index to its benchmark. This research study applying of method of tracking error at JII return and IHSG return. Used data coming from daily closing data,weekly, early final, and final monthly at Jakarta Stock Exchange of January 2001 till December 2003, the value of tracking error are deviate which the value of tracking error