要约撤回，是指在要约生效之前，要约人使要约不发生法律效力的行为。为了尊重要约人的意志和保护要约人的利益，只要要约撤回的通知先于或同时与要约到达受要约人，就可产生撤回的效力。要约撤销，是指要约人在要约生效后，使要约的法律效力归于消灭的意思表示。因为要约的撤销往往涉及受要约人的利益，所以法律对其设定了一定的限制。
文章对EDI合同的形式、生效和要约与承诺的撤回等问题作了分析和探讨。
This thesis intends to make analysis of the form, efficiency, and the withdraw of offer and acceptance concerned with EDI contract.
在要约被受要约人接受以前，要约人可以随时撤回要约。
An offeror may withdraw an offer at any time before it has been accepted.
最为重要的，是削减要约人撤回他的要约的权利。
The most important, is to curtail the offeror's power to withdraw his offer.
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