In this study, the effect of Scratch environment in teaching algorithm in elementary school 6th grade Information and Communication Technologies course was examined. The research method was experimental method. Control group, pretest-posttest design of experimental research method and a convenience sample consisting of 60 6th grade students were used. The research instrument was achievement test to determine the effect of Scratch on learning algorithm. During the implementation process experiment group studied using Scratch and control group studied with traditional methods. The data was analyzed using independent-samples t-test, paired-samples t-test and ANCOVA statistics. According to findings there is no statically significant difference between posttest achievement scores of experiment and control groups. Similarly, In terms of gender there isn't a statically significant difference between posttest scores of experiment and control groups.