检测技术是目前多种学科的关键技术，检测中有两个难题：一个是无法检测的问题，另一个是检测精度提高的问题。基于可拓学矛盾转化的思想方法，提出了一种与传统检测技术不同的新技术--可拓检测，这种检测技术利用可拓学的物元概念及相关方法，从矛盾转化去研究检测技术，以解决无法检测的物理量检测问题。文章给出了可拓检测的有关概念，基本原理及结构，并且提出了有关的实施方法和应用实例。

Detecting is a key technology which has widely been used in almost all fields. However, there are two problems in traditional detecting methods. First, some physical value can not be detected; Second, it is difficult to improve the accuracy according to the way currently in effect. In this paper, based on the transformation concept of the contradiction, a new detecting technology—extension detecting technology (EDT) , which is totally different from the existing ones is developed. EDT takes advantage of the concept of matter element and the related methods of extrinsic. It use the transformation of matter element to study detecting technology. In order to solve detecting problems of undetectable physical value the related concepts, basic principle and frame of extension detecting technology are introduced. An implementing way for its application to engineering is proposed, and an example is given as well.