This research aims to conduct performance measurement efficiency in government and recommends an improvement to reduce the delay of submitting Functional Worksheet (FW) through Lean Six Sigma methodology. At recent system, the causes of delay in submitting FW are human factors i.e. the employee’s negligence and technical factor i.e. duplication work in inputing data. The employee’s performance measurement takes many times so that the leader can evaluate the employee’s FW after 35 days and 195 minutes. In this research, Web-Based Functional Worksheet Information System was designed as the result of the improvement stage of Lean Six Sigma. The Web-Based Functional Worksheet Information System improved the recent system in submitting FW and reduced the time of finishing the submitting FW. Moreover, the leader could evaluate the employee’s FW in a day.