The invention provides a method for breaking through cross-domain request limit and a system thereof. The method comprises the following steps of: respectively establishing a first mapping relationship of each information dictionary object form in a request object and a second mapping relationship of each information dictionary object form in a response object; when a browser which does not support cross-domain resource share initiates a cross-domain request, modifying a request method of the cross-domain request as a request method supported by the browser; packaging each piece of information in a request object of the cross-domain request into request content formed by corresponding keys by the browser according to the first mapping relationship, and sending the request content to a server; after the server receives the request content, assigning an item corresponding to each key in the request content to each piece of information of the request object in the request content received by the server by a pre-filter according to the first mapping relationship; and carrying out response by the server according to the assigned request object. According to the method, the browsers, under IE9, which do not support cross-domain resource share can realize cross-domain requests and are compatible with the largest number of request methods.