This is an announcement for the paper "On maps which preserve equality of distance in F-spaces" by Dongni Tan. Abstract: In order to generalize the results of Mazur-Ulam and Vogt, we shall prove that any map T which preserves equality of distance with T(0)=0 between two F-spaces without surjective condition is linear. Then , as a special case linear isometries are characterized through a simple property of their range. Archive classification: math.FA math.MG Mathematics Subject Classification: 46A16 Remarks: 11 pages, 385 figures The source file(s), DongniTan.tex: 17852 bytes, is(are) stored in gzipped form as 0709.3620.gz with size 6kb. The corresponding postcript file has gzipped size 66kb. Submitted from: 0110127@mail.nankai.edu.cn The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/0709.3620 or http://arXiv.org/abs/0709.3620 or by email in unzipped form by transmitting an empty message with subject line uget 0709.3620 or in gzipped form by using subject line get 0709.3620 to: math@arXiv.org.