Abstract: In existing procedural synthesis methods,manual terrain modeling is a laborious process,which is always difficult to adjust results.To solve these problems,an interactive method based on sketch map is proposed.Utilizing a user-drawn sketch map to exactly control the placement of terrain features,and some control parameters to adjust details of synthesized terrain,the proposed method reaches a good balance between automation and controllability.Experiments show that terrain is synthesized efficiently,and the synthesis result can be controlled conveniently by the users,who may even lack of special modeling skills.To a certain extent,it accelerates the transition from manual to automated terrain modeling.