A new Space Debris Environment Engineering Model SDEEM is developed by Hypervelocity Impact Research Center, Harbin Institute of Technology in China. SDEEM 2015 covers debris size range from 10µm to larger than 10cm, altitude range from 200km to 2000km, time range from year 1959 to 2050, both for space debris and meteoroid particulates. The approaches as high-speed propagator and orbital element discretization method allow convenient and efficient update and upgrade of current version in the future. SDEEM 2015 is presented as software compatible with the usual PC, intended for a wide used of researcher and students in related area. The paper describes the features and results of the SDEEM2015 model, and the updated modeling approach. The historical and future evolution of the space debris environment in terms of spatial density and object fluxes as given by SDEEM2015 are presented and discussed.