In order to show the different possibilities offered by the distance learning, we are looking at the virtual laboratories which benefited from the new training technologies. This approach has the following advantage: reducing the training cost, schedule flexibility, ease of diffusion and the accessibility of the training by a larger audience. In this paper, we present an agents based generic architecture of a digital teaching environment. Specifically we are interested in distance learning using virtual laboratories on the web. The objective of these virtual laboratories is to train a group of learners in the domain of experimental sciences. We have opted for the agent oriented approach to design our environment. Our approach puts the learner's needs and difficulties as the main factor in the design process and the computer modeling of our system. Key words: Virtual laboratory, Tele-TP, Design & modelling, SMA and CITs.