1. A method for simplifying spatial data, comprising: transforming an original coordinate of original spatial data into a view coordinate in a view window according to a preset view control parameter, wherein an original coordinate point of the original spatial data is corresponding to a view coordinate point in a coordinate system of the view window; analyzing whether the view coordinate point conforms to a simplification condition in the view window; and simplifying the original coordinate point corresponding to the view coordinate point that conforms to the simplification condition, according to the result of analyzing.